8 Letter Words Starting with O for Optimal Vocabulary!

Are your children speaking a lot? Do you dream about improving their vocabulary with some interesting words?

If you are thinking that it is vital to strengthen the communication skills of your children, then you must start their lessons at an early age to help them have a varied and vast vocabulary.

If you have the same feeling, then, let us start with some interesting 8 letter words that start with the letter O.

Here we go…

List Of 8-Letter Words Starting With O

oafishlyadverb for lacking elegance, akin to an oaf/ adverb for lacking consideration for others
oaklingsplural of oakling, meaning a small or young oak tree
Oakvillea town in southern Ontario, suburb of Toronto
oarlocksdevices attached to the gunwale of a rowboat to hold the oars in place while rowing
oarweedsplural of oarweed, meaning a brown alga, Laminaria digitata, found on exposed shores
oatcakesplural of oatcake, any of many flat biscuits, or cakes, made from oatmeal
oathablecapable of having an oath administered
oatmealsplural for rolled oats dish/ plural for a thin, watery porridge, formerly fed to the poor
Obamacanmember of the U.S. Republican Party who supported Obama‘s election as president
Obamacona conservative who supports or supported the election of Barack Obama as president
obduracybeing intractable or inflexible/ the quality of having a firm determination to do something
obduratestubbornly, and usually unreasonably, holding to an opinion, decision or purpose/ showing no remorse or regret
obduringpresent participle of obdure
obeahingrelating to a form of magic, medicine or witchcraft originating in Africa 
obeahismalternative of obiism, meaning belief in, or the practice of, the obeah superstitions
obedientcomplying or willing to comply with an order or request/ remaining loyal and steadfast
obeisantcourteously deferential and respectful/ prepared to obey others unquestioningly
obelisedsimple past tense and past participle of obelise
obelisesthird-person singular simple present indicative form of obelise
obelisksplural for a tall, square, tapered, stone monolith topped with a pyramidal point
obelismsplural of obelism, the practice of annotating manuscripts with marks set in the margins
obelizedsimple past tense and past participle of obelize
Oberkorna town in Luxembourg, in the commune of Differdange, in the canton of Esch-sur-Alzette
obeyablecapable of being obeyed
obituarya published announcement of a death, usually with a short biography of the dead person
objectedpast tense for to express one’s opposition to or disagreement with something/ to object to
objectora person who opposes official policy, especially that of an authoritarian state
objuringpresent participle of objure, meaning to swear an oath
oblatelyadverb for having even or level surface/ adverb for relating to monks or monasteries
oblationthe voluntary giving of alms to those in need/ the Christian sacrament of Holy Communion
oblatoryrelating to sacrifice
obligateto bind, compel, or oblige by a social, legal, or moral tie/ to pledge to do something
obligayoa prominent countermelody, often written to be played or sung above the principal theme
obligeesplural of obligee, meaning the party owed an obligation by another party
obligersplural for one who pleases
obliginghappy and ready to do favors for others/ marked by confidence, charm, and elegance
obligorsplural of obligor, meaning the party bearing a legal obligation to another party
obliquedsimple past tense and past participle of oblique
obliquercomparative for located or moving diagonally across or in relation to something 
obliquesplural for a slash symbol/ plural for a sloping surface or edge
obliquid(obsolete) oblique, meaning not straightforward/ indirect
obliviona state of emptiness or nothingness/ the state of being unconscious or in a heavy stupor
oblonglyadverb for longer than wide or wider than long/ adverb for having a shape like a rectangle
oblonguma prolate spheroid/ a figure described by the revolution of an ellipse about its greater axis
Obodritea member of a confederation of medieval West Slavic tribes 
obscenercomparative for shocking or disgusting to the senses/ comparative for deserving of disgust 
obscurednot visible from being hidden or covered/ closed or gray, as of the sky
obscurercomparative for not fully explained or known about/ comparative for visibly unclear
obscuresto physically make less visible or unclear/ to make difficult to understand
obsequieobsolete form of obsequy, meaning the last office for the dead/ a funeral rite
observedvisually noticed/ based on, concerned with, or verifiable by experience or observation
observeeone who is observed
observera person who watches or notices something/ a person who judges the merits of works 
observesto utter words using speech/ to notice or see/ to become aware of through observation
obsessedintensely occupied with, or by, a given topic or emotion/ showing, great feeling or passion
obsessesto be preoccupied with a single topic, thought, or emotion
obsessorone who is obsessive about something
obsidianhaving a jet-black color or pigment/ the molten rock ejected by a volcano from its crater
obsignedsimple past tense and past participle of obsign
obsoleteno longer in use/ characterized by overuse to the point of being uninteresting
obstaclesomething that blocks one’s way/ difference of opinion/ the act of delaying/ iron curtain
obstructto block or clog up a space or opening/ to cause to fail/ to impede the work, or ability of
obtainedto have attained or achieved/ to have come upon after study, searching, or effort
obtainerone who purchases
obtected(obsolete) protected/ covered
obtemperto obey a decree or judgment
obtendedsimple past tense and past participle of obtend
obtruderone who interferes, intrudes, or gets involved when not welcome
obtrudesto interfere in matters that are not one’s concern
obtundedpast tense for to reduce the effects of/ past tense for to decrease in strength or feeling
obturateto block or clog up a space or opening
obtuselyin an obtuse manner/ without liveliness/ in a manner demonstrating a lack of knowledge
obtusestsuperlative for showing no care, emotion, or feeling, especially toward others
obtusitythe quality of being intellectually dull
obversesplural for a coin’s head, or the side of a medal or badge that has the principal design
obvertedsimple past and past participle of obvert, meaning to turn so as to show another side
obviablecapable of being obviated
obviatesto annul by an authoritative act/ to neutralize or cancel by exerting an opposite and equal force
obviatorone who obviates
obvolutethat overlaps something
Obwaldena canton of Switzerland
ocarinaswoodwind musical instruments closed at both sides to produce an enclosed space
occasiona special or noteworthy event, ceremony, or celebration/ a particular incident
occidentcompass direction
occipitaplural for the back or hindmost part of something
occludedpast tense for to obstruct/ past tense for to prohibit or indirect the participation or inclusion of
occluderan object that partially or completely impedes the amount of light reaching the eye
occlusalon the side of a tooth which mates with the opposing tooth/ of or relating to occlusion
occlusora muscle that closes an opening
occultedpast tense for to cover or hide from view, or to obscure the meaning of
occulterany object, natural or man-made, that blocks the light, of an object from an observer
occultlyadverb for mysterious or difficult to understand/ adverb for relating to thaumaturgy, magical
occupantperson who resides in a place/ a legal holder, typically of ownership of something
occupate(obsolete) to occupy
occupiedbusy and engaged in activity or work/ very interested in, or absorbed by, something
occupierone who occupies, with respect to a foreign government controlling the territory of another
occupiesto hold or engage the attention of / to fill or take up/ to inhabit or reside in a place
occurredto have gradually increased in detail/ to have come into being as a result of something
oceanautan explorer in a submarine/ someone who lives or does scientific work underwater
Oceanianrelating to Australia and its surrounding of New Guinea, and the south west Pacific Ocean
Oceanica(archaic) Oceania
oceanitea variety of picrite that is chiefly composed of olivine phenocrysts
ocheringpresent participle of ocher, an earth pigment containing silica, aluminum and ferric oxide
ocherousalternative form of ochrous
ochreateprovided with ochrea, or sheath-formed stipules, as the rhubarb, yellow dock, and knotgrass
ochreousalternative form of ochrous, meaning ochre-colored/ brownish-yellow/ containing ochre
ockerismthe manners or habits of ockers
ocotillovarious succulent plants unrelated to the cactus, in the genus Fouquieria, living in America
octagonsplural for closed plane figure/ plural for a group of eight people or things
octalogy(rare) a set of eight works of art that are connected, it can be seen as eight individual works. 
octaloopan eight-base hairpin loop motif
octanglea geometric figure with eight corners, an octagon
octanoicof or pertaining to octanoic acid or its derivatives
octanolsany of many isomers of the saturated aliphatic alcohol having eight carbon atoms
octantalrelating to an octant
octarchya group of eight people or things
octaroonalternative spelling of octoroon, someone having one-eighth black ancestry
octeracta eight-dimensional hypercube
octettesplural of octette, meaning a group or set of eight of something
Octobersplural of October, meaning the tenth month of the Gregorian calendar, following September
Octoberycharacteristic of the month of October
octodontrefers to the Octodontidae, a rodent’s family with the degu and 12 other South American species
octominoa polymino made up of eight squares
octonarya byte of eight bits
octoniona nonassociative extension of a quaternion
octopodsplural for a cephalopod mollusk with eight sucker-bearing arms
octopolea multipole configuration with eight equal charges arranged in a circular pattern
octopusha fast-paced underwater sport also known as underwater hockey
octupledsimple past tense and past participle of octuple
octuplexhaving eight components
ocularlypertaining to, regarding sight or vision/ adverb for relating to or affecting the nerves
oculistsplural for eye specialist
odaliquea female slave in a harem, especially one in the Ottoman seraglio
odalisksplural of odalisk, alternative of odalisque
oddballsplural for someone or something strange or unusual that is an object of interest
odditiesplural for the quality of being peculiar or strange/ plural for a rare, unusual, or intriguing object
oddmentsplural for a part or quantity that is left after the greater part has been used or removed
Odessiteof or from Odessa/ a native or inhabitant of Odessa
odicallyadverb for of or pertaining to poetry, suitable for poetry, or for writing poetry
odiouslyin an abominable manner
odometera measuring device such as speedometer, milometer, or taximeter
odometrean instrument attached to the wheel of a vehicle to measure the distance traveled
odometrymeasurement of distances by the odometer
odonatesplural for any carnivorous insect of the order Odonata/ plural for a dragonfly or damselfly
odontomaa hamartoma of odontogenic origin
odontoidresembling a tooth, especially in shape
odorantssubstances that have a distinctive smell, especially one added to something for safety purposes
odorizera device to add odor to a gas
odourfulalternative form of odorful, meaning having a distinctive odor
odorlesshaving no odor/ unable to be detected
oecologythe branch of biology dealing with the relationships of organisms with their environment
oedematadropsies or hydrops
oeilladea glance, especially an amorous one/ an ogle
oenologythe scientific study of wines and winemaking
offenderone who causes or gives offense/ a person or party that initiates hostilities with others
officialhaving the approval or authorization of an authority or public body/ traditionally accepted
ointmenta smooth oily substance that is rubbed on the skin for medicinal purposes

Some Other Examples Of 8-Letter Words Starting With O


Interesting Activities For Kids With 8-Letter Words Starting With O

Sometimes, you may feel that it is necessary to teach your little children several useful new words, right?

However, all of your long-term efforts may prove to be completely futile if your young partners do not know how or where to use them.

So, to avoid this, one of the most effective ways is to engage them in some attractive game-like activities. Here are a few of those activities.

1. Name Game

This is an interesting educational activity through which you can teach your little kids some interesting 8 letter words starting with letter O, and also show them how to use those words perfectly. In this game, you have to say something or question something and your kid will give the answer.

You can even play this game in the opposite method. In that case, your child will ask the question and you will become the answerer. Hence, through this learning activity called name game, you can easily show your kids some beneficial 8 letter words starting with O.


Q: What do we call a town in southern Ontario, a suburb of Toronto?

Ans: Oakville

Q: What is the plural for a thin, watery porridge, formerly fed to the poor?

Ans: Oatmeals

Q: What would you call the act of complying or willing to comply with an order or request for remaining loyal?

Ans: Obedient

Q: What is a published announcement of a death, usually with a short biography of the dead person?

Ans: Obituary

Q: What would you call a town in Luxembourg, in the commune of Differdange, in the canton of Esch-sur-Alzette?

Ans: Oberkorn

Q: What would you call something that is not visible from being hidden or covered?

Ans: Obscured

2. Fill In The Blanks

Another very amusing and simple educational activity is widely known as fill-in-the-blanks. Through this method, you may show your tiny tots some widely-used 8 letter words that start with O.

Through this game, your young companions will not only be able to remember the new words without any difficulty but also to utilize them appropriately. Moreover, this kind of easy-to-enjoy word-game will be of major help for their future studies.








  1. B  2) I  3) L  4) C  5) E  6) N

3. Match The Words With Meanings

A matching activity is another quite useful educational game that can help your kids to learn some new words with ease.

Through this amazing concept, your young companion will be able to grasp the ideas of the same and different. For this, you will have to collect two sets of attractive cards.

One set will carry several colorful pictures, while the other will come with some new 8 letter words starting with O, such as occasion, occipita, obviator, occupant, oceanite, ocotillo, octangle, and many more.

Then, you have to tell your tiny companions how to read those cards and the right way to match them with the respective words.

Furthermore, you can show your kids how to do the matching task and instruct them to follow the steps already done by you.


Thus, these are some interesting educational activities to teach your little kids some useful and new 8 letter words starting with O. However, if you need further assistance, just know that we are always here for you.

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