| 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 |
| flintstone | (noun) pebbles of flint used in masonry construction | - |
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| flip | (noun) (sports) the act of throwing the ball to another member of your team | Synonyms: pass, toss |
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| (noun) the act of flipping a coin | Synonyms: toss |
| (noun) a dive in which the diver somersaults before entering the water | - |
| (noun) an acrobatic feat in which the feet roll over the head (either forward or backward) and return | Synonyms: somersault, somersaulting, somerset, summersault, summerset |
| (noun) a sudden, quick movement | - |
| (noun) hot or cold alcoholic mixed drink containing a beaten egg | - |
| flipagram | (noun) a sequence of photos composed into a video | - |
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| flippancy | (noun) inappropriate levity | Synonyms: light-mindedness |
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| flipper | (noun) the flat broad limb of aquatic animals specialized for swimming | - |
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| (noun) a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater) | Synonyms: fin |
| flirt | (noun) playful behavior intended to arouse sexual interest | Synonyms: coquetry, dalliance, flirtation, flirting, toying |
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| (noun) a seductive woman who uses her sex appeal to exploit men | Synonyms: coquette, minx, prickteaser, tease, vamp, vamper |
| flirtation | (noun) playful behavior intended to arouse sexual interest | Synonyms: coquetry, dalliance, flirt, flirting, toying |
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| flirting | (noun) playful behavior intended to arouse sexual interest | Synonyms: coquetry, dalliance, flirt, flirtation, toying |
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| flit | (noun) a sudden quick movement | Synonyms: dart |
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| (noun) a secret move (to avoid paying debts) | - |
| flitch | (noun) salted and cured abdominal wall of a side of pork | Synonyms: side of bacon |
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| (noun) fish steak usually cut from a halibut | - |