| obsessive | (noun) a person who has obsessions | - |
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| occlusive | (noun) a consonant produced by stopping the flow of air at some point and suddenly releasing it | Synonyms: plosive, plosive consonant, plosive speech sound, stop, stop consonant |
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| offensive | (noun) the action of attacking an enemy | Synonyms: offence, offense |
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| ogive | (noun) front consisting of the conical head of a missile or rocket that protects the payload from heat during its passage through the atmosphere | Synonyms: nose cone |
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| olive | (noun) a yellow-green color of low brightness and saturation | - |
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| (noun) one-seeded fruit of the European olive tree usually pickled and used as a relish | - |
| (noun) evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits | Synonyms: European olive tree, Olea europaea |
| (noun) small ovoid fruit of the European olive tree; important food and source of oil | - |
| (noun) hard yellow often variegated wood of an olive tree; used in cabinetwork | - |
| operative | (noun) someone who can be employed as a detective to collect information and assist in criminal investigations | Synonyms: PI, private detective, private eye, private investigator, shamus, sherlock |
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| (noun) a person secretly employed in espionage for a government | Synonyms: intelligence agent, intelligence officer, secret agent |
| optative | (noun) a mood (as in Greek or Sanskrit) that expresses a wish or hope; expressed in English by modal verbs | Synonyms: optative mood |
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| overdrive | (noun) a high gear used at high speeds to maintain the driving speed with less output power | - |
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| (noun) the state of high or excessive activity or productivity or concentration | - |
| palliative | (noun) remedy that alleviates pain without curing | Synonyms: alleviant, alleviator |
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| partitive | (noun) word (such a `some' or `less') that is used to indicate a part as distinct from a whole | - |
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| passive | (noun) the voice used to indicate that the grammatical subject of the verb is the recipient (not the source) of the action denoted by the verb | Synonyms: passive voice |
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| perfective | (noun) the aspect of a verb that expresses a completed action | Synonyms: perfective aspect |
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| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect, perfect tense, perfective tense |
| perspective | (noun) the appearance of things relative to one another as determined by their distance from the viewer | Synonyms: linear perspective |
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| (noun) a way of regarding situations or topics etc. | Synonyms: position, view |
| plosive | (noun) a consonant produced by stopping the flow of air at some point and suddenly releasing it | Synonyms: occlusive, plosive consonant, plosive speech sound, stop, stop consonant |
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| positive | (noun) a film showing a photographic image whose tones correspond to those of the original subject | - |
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| (noun) the primary form of an adjective or adverb; denotes a quality without qualification, comparison, or relation to increase or diminution | Synonyms: positive degree |
| possessive | (noun) the case expressing ownership | Synonyms: genitive, genitive case, possessive case |
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| prerogative | (noun) a right reserved exclusively by a particular person or group (especially a hereditary or official right) | Synonyms: exclusive right, perquisite, privilege |
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| preservative | (noun) a chemical compound that is added to protect against decay or decomposition | - |
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| preventative | (noun) remedy that prevents or slows the course of an illness or disease | Synonyms: preventive, prophylactic |
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| (noun) an agent or device intended to prevent conception | Synonyms: birth control device, contraceptive, contraceptive device, preventive, prophylactic device |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, interference, preventive |
| preventive | (noun) remedy that prevents or slows the course of an illness or disease | Synonyms: preventative, prophylactic |
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| (noun) an agent or device intended to prevent conception | Synonyms: birth control device, contraceptive, contraceptive device, preventative, prophylactic device |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, interference, preventative |
| primitive | (noun) a word serving as the basis for inflected or derived forms | - |
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| (noun) a mathematical expression from which another expression is derived | - |
| (noun) a person who belongs to an early stage of civilization | Synonyms: primitive person |
| progressive | (noun) a person who favors a political philosophy of progress and reform and the protection of civil liberties | Synonyms: liberal, liberalist |
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| (noun) a tense of verbs used in describing action that is on-going | Synonyms: continuous tense, imperfect, imperfect tense, progressive tense |
| purgative | (noun) a purging medicine; stimulates evacuation of the bowels | Synonyms: aperient, cathartic, physic |
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| recessive | (noun) an allele that produces its characteristic phenotype only when its paired allele is identical | Synonyms: recessive allele |
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| recitative | (noun) a vocal passage of narrative text that a singer delivers with natural rhythms of speech | - |
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| reflexive | (noun) a personal pronoun compounded with -self to show the agent's action affects the agent | Synonyms: reflexive pronoun |
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| relative | (noun) an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus) | Synonyms: congenator, congener, congeneric |
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| (noun) a person related by blood or marriage | Synonyms: relation |
| representative | (noun) an item of information that is typical of a class or group | Synonyms: example, illustration, instance |
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| (noun) a person who represents others | - |
| (noun) a member of the United States House of Representatives | - |
| (noun) an advocate who represents someone else's policy or purpose | Synonyms: interpreter, spokesperson, voice |
| restorative | (noun) a device for treating injury or disease | Synonyms: corrective |
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| (noun) a medicine that strengthens and invigorates | Synonyms: tonic |
| retrospective | (noun) an exhibition of a representative selection of an artist's life work | - |
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| sedative | (noun) a drug that reduces excitability and calms a person | Synonyms: depressant, downer, sedative drug |
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| sensitive | (noun) someone who serves as an intermediary between the living and the dead | Synonyms: medium, spiritualist |
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| siccative | (noun) a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture) | Synonyms: desiccant, drier, drying agent |
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| subjunctive | (noun) a mood that represents an act or state (not as a fact but) as contingent or possible | Synonyms: subjunctive mood |
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| substantive | (noun) any word or group of words functioning as a noun | - |
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| subversive | (noun) a radical supporter of political or social revolution | Synonyms: revolutionary, revolutionist, subverter |
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| superlative | (noun) an exaggerated expression (usually of praise) | - |
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| (noun) the superlative form of an adjective or adverb | Synonyms: superlative degree |
| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, meridian, peak, pinnacle, summit, tiptop, top |
| transitive | (noun) a verb (or verb construction) that requires an object in order to be grammatical | Synonyms: transitive verb, transitive verb form |
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| ultraconservative | (noun) an extreme conservative; an opponent of progress or liberalism | Synonyms: extreme right-winger, reactionary |
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| vasoconstrictive | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: pressor, vasoconstrictor |
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| vasodilative | (noun) a drug that causes dilation of blood vessels | Synonyms: vasodilator |
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| vocative | (noun) the case (in some inflected languages) used when the referent of the noun is being addressed | Synonyms: vocative case |
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| vomitive | (noun) a medicine that induces nausea and vomiting | Synonyms: emetic, nauseant, vomit |
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