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961 Nouns That Start With O

Part of Speech:
Word Definitions Synonyms
o (noun) the 15th letter of the Roman alphabet Synonyms: O
oaf (noun) an awkward stupid person Synonyms: clod, gawk, goon, lout, lubber, lummox, lump, stumblebum
oak (noun) a deciduous tree of the genus Quercus; has acorns and lobed leaves Synonyms: oak tree
(noun) the hard durable wood of any oak; used especially for furniture and flooring
oakum (noun) loose hemp or jute fiber obtained by unravelling old ropes; when impregnated with tar it was used to caulk seams and pack joints in wooden ships
oar (noun) an implement used to propel or steer a boat
oarfish (noun) thin deep-water tropical fish 20 to 30 feet long having a red dorsal fin Synonyms: king of the herring, Regalecus glesne, ribbonfish
oarlock (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing Synonyms: peg, pin, rowlock, thole, tholepin
oarsman (noun) a male who rows a boat
oarsmanship (noun) skill as an oarsman
oarswoman (noun) a woman oarsman
oasis (noun) a shelter serving as a place of safety or sanctuary Synonyms: haven
(noun) a fertile tract in a desert (where the water table approaches the surface)
oast (noun) a kiln for drying hops
oat (noun) seed of the annual grass Avena sativa (spoken of primarily in the plural as `oats')
(noun) annual grass of Europe and North Africa; grains used as food and fodder (referred to primarily in the plural: `oats')
oatcake (noun) thin flat unleavened cake of baked oatmeal
oath (noun) a commitment to tell the truth (especially in a court of law); to lie under oath is to become subject to prosecution for perjury Synonyms: swearing
(noun) profane or obscene expression usually of surprise or anger Synonyms: curse, curse word, cuss, expletive, swearing, swearword
(noun) a solemn promise, usually invoking a divine witness, regarding your future acts or behavior
oatmeal (noun) porridge made of rolled oats Synonyms: burgoo
(noun) meal made from rolled or ground oats Synonyms: rolled oats
obbligato (noun) a part of the score that must be performed without change or omission Synonyms: obligato
(noun) a persistent but subordinate motif Synonyms: obligato
obduracy (noun) resoluteness by virtue of being unyielding and inflexible Synonyms: adamance, unyieldingness
obeah (noun) a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas Synonyms: obi
(noun) (West Indies) followers of a religious system involving witchcraft and sorcery Synonyms: obi
obeche (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood Synonyms: arere, obechi, samba, Triplochiton scleroxcylon
(noun) the wood of an African obeche tree; used especially for veneering
obechi (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood Synonyms: arere, obeche, samba, Triplochiton scleroxcylon
obedience (noun) the act of obeying; dutiful or submissive behavior with respect to another person Synonyms: obeisance
(noun) behavior intended to please your parents Synonyms: respect
(noun) the trait of being willing to obey
obeisance (noun) the act of obeying; dutiful or submissive behavior with respect to another person Synonyms: obedience
(noun) bending the head or body or knee as a sign of reverence or submission or shame or greeting Synonyms: bow, bowing
obelion (noun) the craniometric point on the sagittal suture near the lamboid suture
obelisk (noun) a stone pillar having a rectangular cross section tapering towards a pyramidal top
(noun) a character used in printing to indicate a second cross reference or footnote when the asterisk has already been used Synonyms: dagger
obesity (noun) more than average fatness Synonyms: corpulency, fleshiness
obfuscation (noun) the activity of obscuring people's understanding, leaving them baffled or bewildered Synonyms: mystification
(noun) darkening or obscuring the sight of something
(noun) confusion resulting from failure to understand Synonyms: bafflement, befuddlement, bemusement, bewilderment, mystification, puzzlement
obi (noun) a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas Synonyms: obeah
(noun) (West Indies) followers of a religious system involving witchcraft and sorcery Synonyms: obeah
obiism (noun) belief in a kind of sorcery that originated in Africa and is practiced in the West Indies
obit (noun) a notice of someone's death; usually includes a short biography Synonyms: necrology, obituary
obituary (noun) a notice of someone's death; usually includes a short biography Synonyms: necrology, obit
object (noun) a tangible and visible entity; an entity that can cast a shadow Synonyms: physical object
(noun) the goal intended to be attained (and which is believed to be attainable) Synonyms: aim, objective, target
(noun) the focus of cognitions or feelings
(noun) (computing) a discrete item that provides a description of virtually anything known to a computer
(noun) (grammar) a constituent that is acted upon
objectification (noun) the act of representing an abstraction as a physical thing
(noun) a concrete representation of an abstract idea or principle
objection (noun) (law) a procedure whereby a party to a suit says that a particular line of questioning or a particular witness or a piece of evidence or other matter is improper and should not be continued and asks the court to rule on its impropriety or illegality
(noun) the act of protesting; a public (often organized) manifestation of dissent Synonyms: dissent, protest
(noun) the speech act of objecting
(noun) the act of expressing earnest opposition or protest Synonyms: expostulation, remonstrance, remonstration
objectionableness (noun) the quality of being hateful Synonyms: hatefulness, obnoxiousness
objective (noun) the lens or system of lenses in a telescope or microscope that is nearest the object being viewed Synonyms: object glass, object lens, objective lens
(noun) the goal intended to be attained (and which is believed to be attainable) Synonyms: aim, object, target
objectiveness (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices Synonyms: objectivity
objectivity (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices Synonyms: objectiveness
objectivization (noun) the act or process of making or becoming objective.
objector (noun) a person who dissents from some established policy Synonyms: contestant, dissenter, dissident, protester
objurgation (noun) rebuking a person harshly Synonyms: chiding, scolding, tongue-lashing
oblate (noun) a lay person dedicated to religious work or the religious life
oblateness (noun) the property possessed by a round shape that is flattened at the poles Synonyms: ellipticity
oblation (noun) the act of contributing to the funds of a church or charity Synonyms: offering
obligation (noun) the social force that binds you to the courses of action demanded by that force Synonyms: duty, responsibility
(noun) a legal agreement specifying a payment or action and the penalty for failure to comply
(noun) a written promise to repay a debt Synonyms: certificate of indebtedness, debt instrument
(noun) a personal relation in which one is indebted for a service or favor Synonyms: indebtedness
(noun) the state of being obligated to do or pay something
obligato (noun) a part of the score that must be performed without change or omission Synonyms: obbligato
(noun) a persistent but subordinate motif Synonyms: obbligato
obliger (noun) someone who performs a service or does a favor Synonyms: accommodator
obligingness (noun) a disposition or tendency to yield to the will of others Synonyms: complaisance, compliance, compliancy, deference
oblique (noun) a diagonally arranged abdominal muscle on either side of the torso Synonyms: abdominal external oblique muscle, external oblique muscle, musculus obliquus externus abdominis
(noun) any grammatical case other than the nominative Synonyms: oblique case
obliqueness (noun) the property of being neither parallel nor perpendicular, but at a slanting angle
(noun) the quality of being oblique and rambling indirectly Synonyms: deviousness
obliquity (noun) the quality of being deceptive Synonyms: deceptiveness
(noun) the presentation during labor of the head of the fetus at an abnormal angle Synonyms: asynclitism
obliteration (noun) destruction by annihilating something Synonyms: annihilation
(noun) the complete destruction of every trace of something Synonyms: eradication
obliterator (noun) an eliminator that does away with all traces
oblivion (noun) total forgetfulness Synonyms: obliviousness
(noun) the state of being disregarded or forgotten Synonyms: limbo
obliviousness (noun) total forgetfulness Synonyms: oblivion
oblong (noun) a plane figure that deviates from a square or circle due to elongation
oblongness (noun) the property of being shaped like a rectangle Synonyms: rectangularity
obloquy (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions Synonyms: calumniation, calumny, defamation, hatchet job, traducement
(noun) state of disgrace resulting from public abuse Synonyms: opprobrium
obnoxiousness (noun) the quality of being hateful Synonyms: hatefulness, objectionableness
oboe (noun) a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece Synonyms: hautbois, hautboy
oboist (noun) a musician who plays the oboe
obolus (noun) a Greek unit of weight equal to one tenth of a gram
obscenity (noun) an obscene act
(noun) the trait of behaving in an obscene manner Synonyms: bawdiness, lewdness, salaciousness, salacity
(noun) an offensive or indecent word or phrase Synonyms: dirty word, filth, smut, vulgarism
obscurantism (noun) a deliberate act intended to make something obscure
(noun) a policy of opposition to enlightenment or the spread of knowledge
obscurantist (noun) a person who is deliberately vague
obscureness (noun) the quality of being unclear or abstruse and hard to understand Synonyms: abstruseness, obscurity, reconditeness
(noun) the state of being humble and unimportant Synonyms: humbleness, lowliness, unimportance
(noun) the state of being indistinct or indefinite for lack of adequate illumination Synonyms: obscurity
obscurity (noun) the quality of being unclear or abstruse and hard to understand Synonyms: abstruseness, obscureness, reconditeness
(noun) an obscure and unimportant standing; not well known
(noun) the state of being indistinct or indefinite for lack of adequate illumination Synonyms: obscureness
obsequiousness (noun) abject or cringing submissiveness Synonyms: servility, subservience
obsequy (noun) a ceremony at which a dead person is buried or cremated Synonyms: funeral
observance (noun) the act of observing; taking a patient look Synonyms: observation, watching
(noun) conformity with law or custom or practice etc. Synonyms: honoring, honouring
(noun) the act of noticing or paying attention Synonyms: notice, observation
(noun) a formal event performed on a special occasion Synonyms: ceremonial, ceremonial occasion, ceremony
observation (noun) the act of observing; taking a patient look Synonyms: observance, watching
(noun) the act of making and recording a measurement
(noun) the act of noticing or paying attention Synonyms: notice, observance
(noun) facts learned by observing
(noun) a remark expressing careful consideration Synonyms: reflection, reflexion
observatory (noun) a building designed and equipped to observe astronomical phenomena
(noun) a structure commanding a wide view of its surroundings Synonyms: lookout, lookout station, observation tower
observer (noun) a person who becomes aware (of things or events) through the senses Synonyms: beholder, perceiver, percipient
(noun) an expert who observes and comments on something Synonyms: commentator
obsession (noun) an unhealthy and compulsive preoccupation with something or someone Synonyms: fixation
(noun) an irrational motive for performing trivial or repetitive actions, even against your will Synonyms: compulsion
obsessive (noun) a person who has obsessions
obsessiveness (noun) extreme compulsiveness Synonyms: obsessivity
obsessivity (noun) extreme compulsiveness Synonyms: obsessiveness
obsidian (noun) acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces
obsolescence (noun) the process of becoming obsolete; falling into disuse or becoming out of date
obsoleteness (noun) the property of being out of date and not current Synonyms: superannuation
obstacle (noun) an obstruction that stands in the way (and must be removed or surmounted or circumvented)
(noun) something immaterial that stands in the way and must be circumvented or surmounted Synonyms: obstruction
obstetrician (noun) a physician specializing in obstetrics Synonyms: accoucheur
obstetrics (noun) the branch of medicine dealing with childbirth and care of the mother Synonyms: midwifery, OB, tocology
obstinacy (noun) the trait of being difficult to handle or overcome Synonyms: mulishness, obstinance, stubbornness
(noun) resolute adherence to your own ideas or desires Synonyms: bullheadedness, obstinance, pigheadedness, self-will, stubbornness
obstinance (noun) the trait of being difficult to handle or overcome Synonyms: mulishness, obstinacy, stubbornness
(noun) resolute adherence to your own ideas or desires Synonyms: bullheadedness, obstinacy, pigheadedness, self-will, stubbornness
obstipation (noun) severe constipation resulting from an obstruction in the intestines
obstreperousness (noun) noisy defiance
obstructer (noun) any structure that makes progress difficult Synonyms: impediment, impedimenta, obstruction, obstructor
(noun) someone who systematically obstructs some action that others want to take Synonyms: obstructionist, obstructor, resister, thwarter
obstruction (noun) getting in someone's way
(noun) the act of obstructing
(noun) any structure that makes progress difficult Synonyms: impediment, impedimenta, obstructer, obstructor
(noun) something immaterial that stands in the way and must be circumvented or surmounted Synonyms: obstacle
(noun) the physical condition of blocking or filling a passage with an obstruction Synonyms: blockage
obstructionism (noun) deliberate interference
obstructionist (noun) someone who systematically obstructs some action that others want to take Synonyms: obstructer, obstructor, resister, thwarter
obstructor (noun) any structure that makes progress difficult Synonyms: impediment, impedimenta, obstructer, obstruction
(noun) someone who systematically obstructs some action that others want to take Synonyms: obstructer, obstructionist, resister, thwarter
obstruent (noun) a consonant that is produced with a partial or complete blockage of the airflow from the lungs through the nose or mouth
obtainment (noun) the act of obtaining Synonyms: obtention
obtention (noun) the act of obtaining Synonyms: obtainment
obtrusiveness (noun) an unwelcome conspicuousness
obturator (noun) a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate)
obtuseness (noun) the quality of lacking a sharp edge or point
(noun) the quality of being slow to understand Synonyms: dullness
obverse (noun) the side of a coin or medal bearing the principal stamp or design
(noun) the more conspicuous of two alternatives or cases or sides
obviation (noun) the act of preventing something by anticipating and disposing of it effectively Synonyms: forestalling, preclusion

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