| flashcard | (noun) a card with words or numbers or pictures that is flashed to a class by the teacher | Synonyms: flash card |
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| flasher | (noun) an electrical device that automatically turns a lamp on and off (as for an advertising display) | - |
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| (noun) a light that flashes on and off; used as a signal or to send messages | Synonyms: blinker |
| (noun) someone with a compulsive desire to expose the genitals | Synonyms: exhibitionist |
| flashflood | (noun) a sudden local flood of great volume and short duration | Synonyms: flash flood |
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| flashgun | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashbulb, photoflash |
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| flashiness | (noun) tasteless showiness | Synonyms: brashness, garishness, gaudiness, glitz, loudness, meretriciousness, tawdriness |
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| flashing | (noun) sheet metal shaped and attached to a roof for strength and weatherproofing | - |
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| (noun) a short vivid experience | Synonyms: flash |
| flashlight | (noun) a small portable battery-powered electric lamp | Synonyms: torch |
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| flashover | (noun) an unintended electric discharge (as over or around an insulator) | - |
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| flashpoint | (noun) the lowest temperature at which the vapor of a combustible liquid can be ignited in air | Synonyms: flash point |
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| (noun) a place of political unrest and potential violence | Synonyms: hot spot, hotspot, trouble spot |
| (noun) point at which something is ready to blow up | Synonyms: flash point |
| flask | (noun) bottle that has a narrow neck | - |
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| (noun) the quantity a flask will hold | Synonyms: flaskful |
| flaskful | (noun) the quantity a flask will hold | Synonyms: flask |
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| flat | (noun) a suite of rooms usually on one floor of an apartment house | Synonyms: apartment |
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| (noun) scenery consisting of a wooden frame covered with painted canvas; part of a stage setting | - |
| (noun) a deflated pneumatic tire | Synonyms: flat tire |
| (noun) freight car without permanent sides or roof | Synonyms: flatbed, flatcar |
| (noun) a shallow box in which seedlings are started | - |
| (noun) a musical notation indicating one half step lower than the note named | - |
| (noun) a level tract of land | - |
| flatbed | (noun) an open truck bed or trailer with no sides; used to carry large heavy objects | - |
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| (noun) freight car without permanent sides or roof | Synonyms: flat, flatcar |
| flatboat | (noun) a flatbottom boat for carrying heavy loads (especially on canals) | Synonyms: barge, hoy, lighter |
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| flatbread | (noun) any of various breads made from usually unleavened dough | - |
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| flatbrod | (noun) the thin wafer-like bread of Scandinavia | - |
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| flatcar | (noun) freight car without permanent sides or roof | Synonyms: flat, flatbed |
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| flatfish | (noun) any of several families of fishes having flattened bodies that swim along the sea floor on one side of the body with both eyes on the upper side | - |
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| (noun) sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets | - |
| flatfoot | (noun) a foot afflicted with a fallen arch; abnormally flattened and spread out | Synonyms: pes planus, splayfoot |
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| (noun) a policeman who patrols a given region | Synonyms: patrolman |
| flathead | (noun) food fish of the Indonesian region of the Pacific; resembles gurnards | - |
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| (noun) pallid bottom-dwelling flat-headed fish with large eyes and a duck-like snout | - |
| flatiron | (noun) an iron that was heated by placing it on a stove | - |
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| flatlet | (noun) a tiny flat | - |
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| flatmate | (noun) an associate who shares an apartment with you | - |
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| flatness | (noun) the property of having two dimensions | Synonyms: planeness, two-dimensionality |
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| (noun) inactivity; showing an unusual lack of energy | Synonyms: languor, lethargy, phlegm, sluggishness |
| (noun) the property of having little or no contrast; lacking highlights or gloss | Synonyms: lusterlessness, lustrelessness, mat, matt, matte |
| (noun) a deficiency in flavor | - |
| (noun) a want of animation or brilliance | - |
| flats | (noun) footwear (shoes or slippers) with no heel (or a very low heel) | - |
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| flatterer | (noun) a person who uses flattery | Synonyms: adulator |
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| flattery | (noun) excessive or insincere praise | - |
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| flattop | (noun) a large warship that carries planes and has a long flat deck for takeoffs and landings | Synonyms: aircraft carrier, attack aircraft carrier, carrier |
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| (noun) a closely cropped haircut; usually for men or boys | Synonyms: butch, crew cut |
| flatulence | (noun) pompously embellished language | Synonyms: turgidity, turgidness |
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| (noun) a state of excessive gas in the alimentary canal | Synonyms: flatulency, gas |
| flatulency | (noun) a state of excessive gas in the alimentary canal | Synonyms: flatulence, gas |
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| flatus | (noun) a reflex that expels intestinal gas through the anus | Synonyms: breaking wind, fart, farting, wind |
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| flatware | (noun) silverware eating utensils | Synonyms: silver |
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| (noun) tableware that is relatively flat and fashioned as a single piece | - |
| flatwork | (noun) ironing that can be done mechanically | Synonyms: flat wash |
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| flatworm | (noun) parasitic or free-living worms having a flattened body | Synonyms: platyhelminth |
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| flaunt | (noun) the act of displaying something ostentatiously | - |
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| flautist | (noun) someone who plays the flute | Synonyms: flute player, flutist |
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| flavin | (noun) a ketone that forms the nucleus of certain natural yellow pigments like riboflavin | - |
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| flavivirus | (noun) animal viruses belonging to the family Flaviviridae | - |
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| flavone | (noun) a colorless crystalline compound that is part of a number of white or yellow plant pigments | - |
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| flavonoid | (noun) any of a large class of plant pigments having a chemical structure based on or similar to flavone | - |
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| flavor | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavour, nip, relish, sapidity, savor, savour, smack, tang |
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| (noun) (physics) the six kinds of quarks | Synonyms: flavour |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavour, look, smell, spirit, tone |
| flavorer | (noun) something added to food primarily for the savor it imparts | Synonyms: flavoring, flavourer, flavouring, seasoner, seasoning |
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| flavoring | (noun) something added to food primarily for the savor it imparts | Synonyms: flavorer, flavourer, flavouring, seasoner, seasoning |
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| flavorlessness | (noun) the property of having no flavor | Synonyms: flavourlessness, savorlessness, savourlessness, tastelessness |
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| flavorsomeness | (noun) having an appetizing flavor | Synonyms: flavoursomeness, savoriness |
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| flavour | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavor, nip, relish, sapidity, savor, savour, smack, tang |
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| (noun) (physics) the six kinds of quarks | Synonyms: flavor |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavor, look, smell, spirit, tone |
| flavourer | (noun) something added to food primarily for the savor it imparts | Synonyms: flavorer, flavoring, flavouring, seasoner, seasoning |
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| flavouring | (noun) something added to food primarily for the savor it imparts | Synonyms: flavorer, flavoring, flavourer, seasoner, seasoning |
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| flavourlessness | (noun) the property of having no flavor | Synonyms: flavorlessness, savorlessness, savourlessness, tastelessness |
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| flavoursomeness | (noun) having an appetizing flavor | Synonyms: flavorsomeness, savoriness |
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| flaw | (noun) an imperfection in an object or machine | Synonyms: defect, fault |
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| (noun) defect or weakness in a person's character | - |
| (noun) an imperfection in a plan or theory or legal document that causes it to fail or that reduces its effectiveness | - |
| flawlessness | (noun) the state of being without a flaw or defect | Synonyms: ne plus ultra, perfection |
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| flax | (noun) plant of the genus Linum that is cultivated for its seeds and for the fibers of its stem | - |
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| (noun) fiber of the flax plant that is made into thread and woven into linen fabric | - |
| flaxseed | (noun) the seed of flax used as a source of oil | Synonyms: linseed |
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| flea | (noun) any wingless bloodsucking parasitic insect noted for ability to leap | - |
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| fleabag | (noun) a run-down hotel | - |
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| fleabane | (noun) hairy perennial Eurasian herb with yellow daisylike flowers reputed to destroy or drive away fleas | Synonyms: feabane mullet, Pulicaria dysenterica |
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| (noun) any of several North American plants of the genus Erigeron having daisylike flowers; formerly believed to repel fleas | - |
| (noun) common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron | Synonyms: Canadian fleabane, Conyza canadensis, Erigeron canadensis, horseweed |
| fleapit | (noun) an old shabby movie theater | - |
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| fleawort | (noun) plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative | Synonyms: Plantago psyllium, psyllium, Spanish psyllium |
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| flecainide | (noun) oral antiarrhythmic medication (trade name Tambocor) used as a last resort in treating arrhythmias; increases the risk of sudden death in heart attack patients | Synonyms: Tambocor |
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| fleck | (noun) a small contrasting part of something | Synonyms: dapple, maculation, patch, speckle, spot |
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| (noun) a small fragment of something broken off from the whole | Synonyms: bit, chip, flake, scrap |
| flection | (noun) deviation from a straight or normal course | Synonyms: flexion, inflection |
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| (noun) the state of being flexed (as of a joint) | Synonyms: flexion, flexure |
| fledgeling | (noun) young bird that has just fledged or become capable of flying | Synonyms: fledgling |
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| (noun) any new participant in some activity | Synonyms: entrant, fledgling, freshman, neophyte, newbie, newcomer, starter |
| fledgling | (noun) young bird that has just fledged or become capable of flying | Synonyms: fledgeling |
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| (noun) any new participant in some activity | Synonyms: entrant, fledgeling, freshman, neophyte, newbie, newcomer, starter |
| fleece | (noun) outer coat of especially sheep and yaks | Synonyms: wool |
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| (noun) a soft bulky fabric with deep pile; used chiefly for clothing | - |
| (noun) the wool of a sheep or similar animal | - |
| (noun) tanned skin of a sheep with the fleece left on; used for clothing | Synonyms: sheepskin |
| fleer | (noun) someone who flees from an uncongenial situation | Synonyms: fugitive, runaway |
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| (noun) contempt expressed by mockery in looks or words | - |
| fleet | (noun) a group of warships organized as a tactical unit | - |
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| (noun) a group of steamships operating together under the same ownership | - |
| (noun) group of motor vehicles operating together under the same ownership | - |
| (noun) group of aircraft operating together under the same ownership | - |
| fleetingness | (noun) the property of lasting for a very short time | Synonyms: ephemerality, ephemeralness |
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| fleetness | (noun) rapidity of movement | - |
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| flerovium | (noun) a radioactive transuranic element | Synonyms: Fl |
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| flesh | (noun) alternative names for the body of a human being | Synonyms: anatomy, bod, build, chassis, figure, form, frame, human body, material body, physical body, physique, shape, soma |
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| (noun) the soft tissue of the body of a vertebrate: mainly muscle tissue and fat | - |
| (noun) a soft moist part of a fruit | Synonyms: pulp |
| fleshiness | (noun) more than average fatness | Synonyms: corpulency, obesity |
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| flews | (noun) The fleshy hanging upper lip of a bloodhound or similar dog. | - |
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| flex | (noun) the act of flexing | - |
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| flexibility | (noun) the quality of being adaptable or variable | Synonyms: flexibleness |
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| (noun) the property of being flexible; easily bent or shaped | Synonyms: flexibleness |
| (noun) the trait of being easily persuaded | Synonyms: tractability, tractableness |
| flexibleness | (noun) the property of being flexible; easily bent or shaped | Synonyms: flexibility |
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| (noun) the quality of being adaptable or variable | Synonyms: flexibility |
| flexion | (noun) act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased | Synonyms: flexure |
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| (noun) deviation from a straight or normal course | Synonyms: flection, inflection |
| (noun) the state of being flexed (as of a joint) | Synonyms: flection, flexure |
| flexitarianism | (noun) The practice of eating mainly vegetarian food, but making occasional exceptions for social, pragmatic, cultural, or nutritional reasons. | Synonyms: semi-vegetarianism |
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| flexor | (noun) a skeletal muscle whose contraction bends a joint | Synonyms: flexor muscle |
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| flexure | (noun) act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased | Synonyms: flexion |
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| (noun) an angular or rounded shape made by folding | Synonyms: bend, crease, crimp, fold, plication |
| (noun) the state of being flexed (as of a joint) | Synonyms: flection, flexion |
| flibbertigibbet | (noun) a female fool | Synonyms: foolish woman |
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| flick | (noun) a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement | Synonyms: film, motion-picture show, motion picture, movie, moving-picture show, moving picture, pic, picture, picture show |
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| (noun) a short stroke | - |
| (noun) a light sharp contact (usually with something flexible) | - |
| flicker | (noun) the act of moving back and forth | Synonyms: flutter, waver |
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| (noun) North American woodpecker | - |
| (noun) a momentary flash of light | Synonyms: glint, spark |
| flickertail | (noun) of sagebrush and grassland areas of western United States and Canada | Synonyms: Citellus richardsoni, Richardson ground squirrel |
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| flier | (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, broadside, circular, flyer, handbill, throwaway |
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| (noun) someone who travels by air | Synonyms: flyer |
| (noun) someone who operates an aircraft | Synonyms: aeronaut, aviator, flyer |
| flies | (noun) (theater) the space over the stage (out of view of the audience) used to store scenery (drop curtains) | - |
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| flight | (noun) an instance of traveling by air | Synonyms: flying |
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| (noun) the act of escaping physically | Synonyms: escape |
| (noun) a scheduled trip by plane between designated airports | - |
| (noun) a stairway (set of steps) between one floor or landing and the next | Synonyms: flight of stairs, flight of steps |
| (noun) passing above and beyond ordinary bounds | - |
| (noun) an air force unit smaller than a squadron | - |
| (noun) a formation of aircraft in flight | - |
| (noun) a flock of flying birds | - |
| (noun) the path followed by an object moving through space | Synonyms: trajectory |
| flightiness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: arbitrariness, capriciousness, whimsey, whimsicality, whimsy |
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| flightlessness | (noun) The condition of being unable to fly, usually used with birds such as the penguin, ostrich, and emu. | - |
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| flimflam | (noun) a swindle in which you cheat at gambling or persuade a person to buy worthless property | Synonyms: bunco, bunco game, bunko, bunko game, con, con game, confidence game, confidence trick, hustle, sting |
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| flimsiness | (noun) the property of weakness by virtue of careless construction | Synonyms: shoddiness |
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| flimsy | (noun) a thin strong lightweight translucent paper used especially for making carbon copies | Synonyms: onionskin |
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| flinch | (noun) a reflex response to sudden pain | Synonyms: wince |
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| flinders | (noun) bits and splinters and fragments | - |
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| flindosa | (noun) tall Australian timber tree yielding tough hard wood used for staves etc | Synonyms: Flindersia australis, flindosy, native beech |
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| flindosy | (noun) tall Australian timber tree yielding tough hard wood used for staves etc | Synonyms: Flindersia australis, flindosa, native beech |
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| fling | (noun) a brief indulgence of your impulses | Synonyms: spree |
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| (noun) a usually brief attempt | Synonyms: crack, go, offer, pass, whirl |
| (noun) the act of flinging | - |
| flint | (noun) a hard kind of stone; a form of silica more opaque than chalcedony | - |
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| flinthead | (noun) an American stork that resembles the true ibises in having a downward-curved bill; inhabits wooded swamps of New World tropics | Synonyms: Mycteria americana, wood ibis, wood stork |
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| flintlock | (noun) an obsolete gunlock that has flint embedded in the hammer; the flint makes a spark that ignites the charge | - |
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| (noun) a muzzle loader that had a flintlock type of gunlock | Synonyms: firelock |