| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| amberfish | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberjack |
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| anglerfish | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: allmouth, angler, angler fish, goosefish, Lophius Americanus, lotte, monkfish |
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| archerfish | (noun) any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia | Synonyms: Toxotes jaculatrix |
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| buckminsterfullerene | (noun) a spheroidal fullerene; the first known example of a fullerene | Synonyms: buckyball |
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| butterfat | (noun) the fatty substance of milk from which butter is made | - |
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| butterfingered | (adjective) lacking physical movement skills, especially with the hands | Synonyms: bumbling, bungling, ham-fisted, ham-handed, handless, heavy-handed, left-handed |
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| butterfingers | (noun) someone who drops things (especially one who cannot catch a ball) | - |
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| butterfish | (noun) small marine fish with a short compressed body and feeble spines | Synonyms: stromateid, stromateid fish |
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| (noun) slippery scaleless food fish of the northern Atlantic coastal waters | Synonyms: Pholis gunnellus, rock gunnel |
| (noun) any of numerous small flat Atlantic food fish having smooth skin | - |
| butterflower | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, crowfoot, goldcup, kingcup |
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| butterfly | (noun) a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down | Synonyms: butterfly stroke |
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| (noun) diurnal insect typically having a slender body with knobbed antennae and broad colorful wings | - |
| (verb) talk or behave amorously, without serious intentions | Synonyms: chat up, coquet, coquette, dally, flirt, mash, philander, romance |
| (verb) cut and spread open, as in preparation for cooking | - |
| (verb) flutter like a butterfly | - |
| butterflyfish | (noun) tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins | Synonyms: flying gurnard, flying robin |
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| centerfield | (noun) the fielding position of the player on a baseball team who is expected to field balls in the central third of the outfield | Synonyms: center field |
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| (noun) the piece of ground in the outfield directly ahead of the catcher | Synonyms: center, center field, centre |
| centerfielder | (noun) the person who plays center field | Synonyms: center fielder |
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| centerfold | (noun) a magazine center spread; especially a foldout of a large photograph or map or other feature | Synonyms: centrefold |
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| cheerful | (adjective) being full of or promoting cheer; having or showing good spirits | - |
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| (adjective) pleasantly (even unrealistically) optimistic | Synonyms: pollyannaish, upbeat |
| cheerfully | (adverb) in a cheerful manner | - |
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| cheerfulness | (noun) the quality of being cheerful and dispelling gloom | Synonyms: cheer, sunniness, sunshine |
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| (noun) a feeling of spontaneous good spirits | Synonyms: blitheness |
| chesterfield | (noun) a fitted overcoat with a velvet collar | - |
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| (noun) an overstuffed davenport with upright armrests | - |
| chiggerflower | (noun) erect perennial of eastern and southern United States having showy orange flowers | Synonyms: Asclepias tuberosa, butterfly weed, chigger flower, Indian paintbrush, orange milkweed, pleurisy root, tuber root |
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| clusterfuck | (noun) A chaotic situation where everything seems to go wrong | - |
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| containerful | (noun) the quantity that a container will hold | - |
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| counterfactual | (adjective) going counter to the facts (usually as a hypothesis) | Synonyms: contrary to fact |
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| counterfactuality | (noun) the quality of being contrary to fact | - |
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| counterfeit | (adjective) not genuine; imitating something superior | Synonyms: imitative |
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| (noun) a copy that is represented as the original | Synonyms: forgery |
| (verb) make a copy of with the intent to deceive | Synonyms: fake, forge |
| counterfeiter | (noun) someone who makes copies illegally | Synonyms: forger |
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| counterfire | (noun) fire intended to neutralize or destroy enemy weapons | - |
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| counterfoil | (noun) the part of a check that is retained as a record | Synonyms: check stub, stub |
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| featherfoil | (noun) a plant of the genus Hottonia | Synonyms: feather-foil |
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| feverfew | (noun) bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum parthenium, Tanacetum parthenium |
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| fingerflower | (noun) tall leafy European biennial or perennial having spectacular clusters of large tubular pink-purple flowers; leaves yield drug digitalis and are poisonous to livestock | Synonyms: common foxglove, Digitalis purpurea, fairy bell, finger-flower, finger-root, fingerroot |
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| gerfalcon | (noun) large and rare Arctic falcon having white and dark color phases | Synonyms: Falco rusticolus, gyrfalcon |
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| hyperfine | (adjective) extremely fine or thin, as in a spectral line split into two or more components | - |
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| imperfect | (adjective) not perfect; defective or inadequate | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: fallible, frail, weak |
| (noun) a tense of verbs used in describing action that is on-going | Synonyms: continuous tense, imperfect tense, progressive, progressive tense |
| imperfectibility | (noun) the capability of becoming imperfect | - |
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| imperfectible | (adjective) capable of being made imperfect | - |
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| imperfection | (noun) the state or an instance of being imperfect | Synonyms: imperfectness |
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| imperfective | (noun) aspect without regard to the beginning or completion of the action of the verb | Synonyms: imperfective aspect |
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| imperfectly | (adverb) in an imperfect or faulty way | Synonyms: amiss |
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| imperfectness | (noun) the state or an instance of being imperfect | Synonyms: imperfection |
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| imperforate | (adjective) not perforated; having no opening | - |
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| interface | (noun) (chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases) | - |
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| (noun) (computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals) | Synonyms: port |
| (noun) the overlap where two theories or phenomena affect each other or have links with each other | - |
| (noun) (computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system | Synonyms: user interface |
| interfacial | (adjective) relating to or situated at an interface | - |
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| interfaith | (adjective) involving persons of different religious faiths | - |
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| interfere | (verb) get involved, so as to alter or hinder an action, or through force or threat of force | Synonyms: interpose, intervene, step in |
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| (verb) come between so as to be hindrance or obstacle | - |
| interference | (noun) the act of hindering or obstructing or impeding | Synonyms: hinderance, hindrance |
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| (noun) (American football) blocking a player's path with your body | - |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, preventative, preventive |
| (noun) a policy of intervening in the affairs of other countries | Synonyms: intervention |
| (noun) electrical or acoustic activity that can disturb communication | Synonyms: disturbance, noise |
| interfering | (adjective) intrusive in a meddling or offensive manner | Synonyms: busy, busybodied, meddlesome, meddling, officious |
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| interferometer | (noun) any measuring instrument that uses interference patterns to make accurate measurements of waves | - |
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| interferon | (noun) an antiviral protein produced by cells that have been invaded by a virus; inhibits replication of the virus | - |
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| interfixation | (noun) derivation of a new word by inserting an interfix between two morphemes. | - |
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| kerfuffle | (noun) a disorderly outburst or tumult | Synonyms: commotion, disruption, disturbance, flutter, hoo-ha, hoo-hah, hurly burly, to-do |
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| leatherfish | (noun) any of several brightly colored tropical filefishes | Synonyms: leatherjacket |
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| masterful | (adjective) having or revealing supreme mastery or skill | Synonyms: consummate, masterly, virtuoso |
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| masterfully | (adverb) in a skillfully masterful manner; with the skill of a master | - |
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| materfamilias | (noun) a female head of a family or tribe | Synonyms: matriarch |
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| motherfucker | (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, bastard, cocksucker, dickhead, mother fucker, prick, shit, SOB, son of a bitch, whoreson |
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| noninterference | (noun) a foreign policy of staying out of other countries' disputes | Synonyms: nonintervention |
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| nonperformance | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, neglect, negligence |
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| outperform | (verb) be or do something to a greater degree | Synonyms: exceed, outdo, outgo, outmatch, outstrip, surmount, surpass |
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| overfamiliar | (adjective) taking undue liberties | - |
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| overfamiliarity | (noun) The state of being common or repeated to the point of being unnoticed or annoying. | - |
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| overfatigue | (verb) tire excessively | Synonyms: overtire, overweary |
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| overfed | (adjective) too well nourished | - |
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| overfeed | (verb) feed excessively | - |
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| overfeeding | (noun) excessive feeding | - |
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| overfill | (verb) fill beyond capacity | - |
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| overflight | (noun) a flight by an aircraft over a particular area (especially over an area in foreign territory) | - |
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| overflow | (noun) a large flow | Synonyms: flood, outpouring |
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| (noun) the occurrence of surplus liquid (as water) exceeding the limit or capacity | Synonyms: overspill, runoff |
| (verb) overflow with a certain feeling | Synonyms: bubble over, spill over |
| (verb) flow or run over (a limit or brim) | Synonyms: brim over, overrun, run over, well over |
| overflowing | (adjective) covered with water | Synonyms: afloat, awash, flooded, inundated |
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| overfly | (verb) fly over | Synonyms: pass over |
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| overfond | (adjective) excessively fond | - |
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| overfull | (adjective) exceeding demand | Synonyms: glutted |
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| oysterfish | (noun) a variety of toadfish | Synonyms: oyster-fish, oyster fish |
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| paterfamilias | (noun) the male head of family or tribe | Synonyms: patriarch |
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| perfect | (adjective) being complete of its kind and without defect or blemish | - |
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| (adjective) precisely accurate or exact | - |
| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, pure, sodding, staring, stark, thorough, thoroughgoing, unadulterated, utter |
| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect tense, perfective, perfective tense |
| (verb) make perfect or complete | Synonyms: hone |
| perfecta | (noun) a bet that you can pick the first and second finishers in the right order | Synonyms: exacta |
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| perfected | (adjective) (of plans, ideas, etc.) perfectly formed | - |
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| perfecter | (noun) a skilled worker who perfects something | - |
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| perfectibility | (noun) the capability of becoming perfect | - |
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| perfectible | (adjective) capable of becoming or being made perfect | - |
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| perfection | (noun) the act of making something perfect | - |
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| (noun) an ideal instance; a perfect embodiment of a concept | Synonyms: beau ideal, idol, paragon |
| (noun) the state of being without a flaw or defect | Synonyms: flawlessness, ne plus ultra |
| perfectionism | (noun) a disposition to feel that anything less than perfect is unacceptable | - |
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| perfectionist | (noun) a person who is displeased by anything that does not meet very high standards | - |
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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 |
| perfectly | (adverb) completely and without qualification; used informally as intensifiers | Synonyms: absolutely, dead, utterly |
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| (adverb) in a perfect or faultless way | - |
| perfervid | (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, fiery, impassioned, torrid |
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| perfidious | (adjective) tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans | Synonyms: punic, treacherous |
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| perfidiously | (adverb) in a perfidious manner | - |
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| perfidiousness | (noun) betrayal of a trust | Synonyms: perfidy, treachery |
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| perfidy | (noun) an act of deliberate betrayal | Synonyms: betrayal, treachery, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, treachery |
| perfluorocarbon | (noun) a powerful greenhouse gas emitted during the production of aluminum | Synonyms: PFC |
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| perfoliate | (adjective) (of a leaf) having the base united around (and apparently pierced by) the stem | - |
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| perforate | (adjective) having a hole cut through | Synonyms: perforated, pierced, punctured |
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| (verb) make a hole into or between, as for ease of separation | Synonyms: punch |
| (verb) pass into or through, often by overcoming resistance | Synonyms: penetrate |
| perforated | (adjective) having a number or series of holes | - |
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| (adjective) having a hole cut through | Synonyms: perforate, pierced, punctured |
| perforation | (noun) the act of punching a hole (especially a row of holes as for ease of separation) | - |
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| (noun) a line of small holes for tearing at a particular place | - |
| (noun) a hole made in something | - |
| perforce | (adverb) by necessity; by force of circumstance | - |
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| perform | (verb) carry out or perform an action | Synonyms: do, execute |
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| (verb) give a performance (of something) | - |
| (verb) get (something) done | Synonyms: do |
| (verb) perform a function | - |
| performance | (noun) the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it | Synonyms: carrying into action, carrying out, execution |
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| (noun) the act of presenting a play or a piece of music or other entertainment | - |
| (noun) any recognized accomplishment | - |
| (noun) a dramatic or musical entertainment | Synonyms: public presentation |
| (noun) process or manner of functioning or operating | Synonyms: functioning, operation |
| performer | (noun) an entertainer who performs a dramatic or musical work for an audience | Synonyms: performing artist |
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| performing | (noun) the performance of a part or role in a drama | Synonyms: acting, playacting, playing |
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