| blooper | (noun) an embarrassing mistake | Synonyms: bloomer, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| cefoperazone | (noun) a parenteral cephalosporin (trade name Cefobid) used for severe infections | Synonyms: Cefobid |
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| cooper | (noun) a craftsman who makes or repairs wooden barrels or tubs | Synonyms: barrel maker |
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| cooperation | (noun) joint operation or action | - |
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| (noun) the practice of cooperating | - |
| cooperative | (noun) a jointly owned commercial enterprise (usually organized by farmers or consumers) that produces and distributes goods and services and is run for the benefit of its owners | Synonyms: co-op |
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| (noun) an association formed and operated for the benefit of those using it | - |
| cooperativeness | (noun) the trait of being cooperative | Synonyms: amenability, amenableness |
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| cooperator | (noun) an associate in an activity or endeavor or sphere of common interest | Synonyms: collaborator, pardner, partner |
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| developer | (noun) photographic equipment consisting of a chemical solution for developing film | - |
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| (noun) someone who develops real estate (especially someone who prepares a site for residential or commercial use) | - |
| haloperidol | (noun) tranquilizer (trade name Haldol) used to treat some psychotic disorders and Tourette's syndrome | Synonyms: Haldol |
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| hoper | (noun) a person who hopes | - |
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| improperness | (noun) an improper demeanor | Synonyms: impropriety |
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| interloper | (noun) someone who intrudes on the privacy or property of another without permission | Synonyms: intruder, trespasser |
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| interoperability | (noun) (computer science) the ability to exchange and use information (usually in a large heterogeneous network made up of several local area networks) | - |
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| looper | (noun) small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae | Synonyms: inchworm, measuring worm |
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| opera | (noun) a building where musical dramas are performed | Synonyms: opera house |
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| (noun) a drama set to music; consists of singing with orchestral accompaniment and an orchestral overture and interludes | - |
| operagoer | (noun) a patron of the opera | - |
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| operand | (noun) a quantity upon which a mathematical operation is performed | - |
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| operation | (noun) a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body | Synonyms: surgery, surgical operation, surgical procedure, surgical process |
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| (noun) (mathematics) calculation by mathematical methods | Synonyms: mathematical operation, mathematical process |
| (noun) activity by a military or naval force (as a maneuver or campaign) | Synonyms: military operation |
| (noun) a planned activity involving many people performing various actions | - |
| (noun) a process or series of acts especially of a practical or mechanical nature involved in a particular form of work | Synonyms: procedure |
| (noun) a business especially one run on a large scale | - |
| (noun) the activity of operating something (a machine or business etc.) | - |
| (noun) (psychology) the performance of some composite cognitive activity; an operation that affects mental contents | Synonyms: cognitive operation, cognitive process, mental process, process |
| (noun) (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction) | - |
| (noun) process or manner of functioning or operating | Synonyms: functioning, performance |
| (noun) the state of being in effect or being operative | - |
| operationalism | (noun) (philosophy) the doctrine that the meaning of a proposition consists of the operations involved in proving or applying it | - |
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| operations | (noun) financial transactions at a brokerage; having to do with the execution of trades and keeping customer records | Synonyms: trading operations |
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| 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 |
| operator | (noun) an agent that operates some apparatus or machine | Synonyms: manipulator |
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| (noun) someone who owns or operates a business | - |
| (noun) a shrewd or unscrupulous person who knows how to circumvent difficulties | Synonyms: hustler, wheeler dealer |
| (noun) a speculator who trades aggressively on stock or commodity markets | - |
| (noun) (mathematics) a symbol or function representing a mathematical operation | - |
| operculum | (noun) a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted | - |
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| operetta | (noun) a short amusing opera | Synonyms: light opera |
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| operon | (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene | - |
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| operoseness | (noun) the quality of requiring extended effort | Synonyms: laboriousness, toilsomeness |
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| paratrooper | (noun) a soldier in the paratroops | Synonyms: para |
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| popery | (noun) offensive terms for the practices and rituals of the Roman Catholic Church | Synonyms: papism |
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| properness | (noun) correct or appropriate behavior | Synonyms: correctitude, propriety |
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| property | (noun) any movable articles or objects used on the set of a play or movie | Synonyms: prop |
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| (noun) a basic or essential property shared by all members of a class | - |
| (noun) a construct whereby objects or individuals can be distinguished | Synonyms: attribute, dimension |
| (noun) any area set aside for a particular purpose | Synonyms: place |
| (noun) something owned; any tangible or intangible possession that is owned by someone | Synonyms: belongings, holding |
| roper | (noun) a craftsman who makes ropes | Synonyms: rope-maker, ropemaker |
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| (noun) a cowboy who uses a lasso to rope cattle or horses | - |
| (noun) a decoy who lures customers into a gambling establishment (especially one with a fixed game) | - |
| sinoper | (noun) a red ocher formerly used as a pigment | Synonyms: sinopia, sinopis |
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| snooper | (noun) a spy who makes uninvited inquiries into the private affairs of others | Synonyms: snoop |
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| stooper | (noun) a person who carries himself or herself with the head and shoulders habitually bent forward | - |
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| (noun) a person at a racetrack who searches for winning parimutuel tickets that have been carelessly discarded by others | - |
| toper | (noun) a person who drinks alcoholic beverages (especially to excess) | Synonyms: drinker, imbiber, juicer |
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| trooper | (noun) a mounted police officer | - |
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| (noun) a soldier in a motorized army unit | Synonyms: cavalryman |
| (noun) a state police officer | Synonyms: state trooper |
| (noun) a soldier mounted on horseback | Synonyms: cavalryman |
| walloper | (noun) a gross untruth; a blatant lie | Synonyms: whopper |
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| (noun) a winner by a wide margin | - |
| (noun) a very hard hitter | - |
| whooper | (noun) common Old World swan noted for its whooping call | Synonyms: Cygnus cygnus, whooper swan |
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| (noun) rare North American crane having black-and-white plumage and a trumpeting call | Synonyms: Grus americana, whooping crane |