| firepower | (noun) (military) the relative capacity for delivering fire on a target | - |
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| firewater | (noun) any strong spirits (such as strong whisky or rum) | - |
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| fisher | (noun) large dark brown North American arboreal carnivorous mammal | Synonyms: black cat, fisher cat, Martes pennanti, pekan |
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| (noun) someone whose occupation is catching fish | Synonyms: fisherman |
| fishmonger | (noun) someone who sells fish | Synonyms: fishwife |
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| fitter | (adjective) improved in health or physical condition | Synonyms: healthier |
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| (noun) someone who fits a garment to a particular person | - |
| fiver | (noun) a United States bill worth 5 dollars | Synonyms: five-spot, five dollar bill |
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| fixer | (noun) synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction | Synonyms: dolophine hydrochloride, methadon, methadone, methadone hydrochloride, synthetic heroin |
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| (noun) someone who intervenes with authorities for a person in trouble (usually using underhand or illegal methods for a fee) | Synonyms: influence peddler |
| (noun) a skilled worker who mends or repairs things | Synonyms: mender, repairer |
| (noun) a chemical compound that sets or fixes something (as a dye or a photographic image) | Synonyms: fixing agent |
| flameflower | (noun) plant with fleshy roots and erect stems with narrow succulent leaves and one reddish-orange flower in each upper leaf axil; southwestern United States; Indians once cooked the fleshy roots | Synonyms: flame-flower, flame flower, Talinum aurantiacum |
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| (noun) a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers | Synonyms: flame-flower, flame flower, kniphofia, tritoma |
| flamethrower | (noun) a weapon that squirts ignited fuel for several yards | - |
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| flanker | (noun) a soldier who is a member of a detachment assigned to guard the flanks of a military formation | - |
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| (noun) a back stationed wide of the scrimmage line; used as a pass receiver | Synonyms: flanker back |
| flapper | (noun) a young woman in the 1920s who flaunted her unconventional conduct and dress | - |
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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 |
| flashover | (noun) an unintended electric discharge (as over or around an insulator) | - |
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| flatter | (verb) praise somewhat dishonestly | Synonyms: blandish |
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| flatterer | (noun) a person who uses flattery | Synonyms: adulator |
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| flavorer | (noun) something added to food primarily for the savor it imparts | Synonyms: flavoring, flavourer, flavouring, seasoner, seasoning |
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| flavourer | (noun) something added to food primarily for the savor it imparts | Synonyms: flavorer, flavoring, flavouring, seasoner, seasoning |
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| 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 | - |
| (verb) to smirk contemptuously | - |
| 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 |
| (verb) move back and forth very rapidly | Synonyms: flitter, flutter, quiver, waver |
| (verb) flash intermittently | Synonyms: flick |
| (verb) shine unsteadily | Synonyms: flick |
| 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 |
| 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 |
| flitter | (verb) move back and forth very rapidly | Synonyms: flicker, flutter, quiver, waver |
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| floater | (noun) an insurance policy covering loss of movable property (e.g. jewelry) regardless of its location | Synonyms: floating policy |
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| (noun) an object that floats or is capable of floating | - |
| (noun) a swimmer who floats in the water | - |
| (noun) a wanderer who has no established residence or visible means of support | Synonyms: clochard, drifter, vagabond, vagrant |
| (noun) a voter who votes illegally at different polling places in the same election | - |
| (noun) an employee who is reassigned from job to job as needed | - |
| (noun) a debt instrument with a variable interest rate tied to some other interest rate (e.g. the rate paid by T-bills) | - |
| (noun) spots before the eyes caused by opaque cell fragments in the vitreous humor and lens | Synonyms: musca volitans, muscae volitantes, spots |
| flogger | (noun) a torturer who flogs or scourges (especially an official whose duty is to whip offenders) | Synonyms: scourger |
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| floorwalker | (noun) an employee of a retail store who supervises sales personnel and helps with customer problems | Synonyms: shopwalker |
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| flounder | (noun) any of various European and non-European marine flatfish | - |
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| (noun) flesh of any of various American and European flatfish | - |
| (verb) walk with great difficulty | Synonyms: stagger |
| (verb) behave awkwardly; have difficulties | - |
| flouter | (noun) someone who jeers or mocks or treats something with contempt or calls out in derision | Synonyms: jeerer, mocker, scoffer |
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| flower | (noun) a plant cultivated for its blooms or blossoms | - |
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| (noun) reproductive organ of angiosperm plants especially one having showy or colorful parts | Synonyms: bloom, blossom |
| (noun) the period of greatest prosperity or productivity | Synonyms: bloom, blossom, efflorescence, flush, heyday, peak, prime |
| (verb) produce or yield flowers | Synonyms: bloom, blossom |
| fluster | (noun) a disposition that is confused or nervous and upset | Synonyms: perturbation |
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| (verb) cause to be nervous or upset | - |
| (verb) be flustered; behave in a confused manner | - |
| flutter | (noun) the act of moving back and forth | Synonyms: flicker, waver |
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| (noun) the motion made by flapping up and down | Synonyms: flap, flapping, fluttering |
| (noun) abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block | - |
| (noun) a disorderly outburst or tumult | Synonyms: commotion, disruption, disturbance, hoo-ha, hoo-hah, hurly burly, kerfuffle, to-do |
| (verb) wink briefly | Synonyms: bat |
| (verb) beat rapidly | Synonyms: palpitate |
| (verb) move back and forth very rapidly | Synonyms: flicker, flitter, quiver, waver |
| (verb) move along rapidly and lightly; skim or dart | Synonyms: dart, fleet, flit |
| (verb) flap the wings rapidly or fly with flapping movements | - |
| fluxmeter | (noun) meter that measures magnetic flux by the current it generates in a coil | - |
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| flycatcher | (noun) any of a large group of small songbirds that feed on insects taken on the wing | Synonyms: Old World flycatcher, true flycatcher |
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| (noun) large American birds that characteristically catch insects on the wing | Synonyms: New World flycatcher, tyrant bird, tyrant flycatcher |
| flyer | (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, broadside, circular, flier, handbill, throwaway |
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| (noun) someone who travels by air | Synonyms: flier |
| (noun) someone who operates an aircraft | Synonyms: aeronaut, aviator, flier |
| flyover | (noun) a flight at a low altitude (usually of military aircraft) over spectators on the ground | Synonyms: fly-by, flypast |
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| (noun) bridge formed by the upper level of a crossing of two highways at different levels | Synonyms: overpass |
| flypaper | (noun) paper that is poisoned or coated with a sticky substance to kill flies | - |
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| flyswatter | (noun) an implement with a flat part (of mesh or plastic) and a long handle; used to kill insects | Synonyms: flyswat, swatter |
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| foamflower | (noun) stoloniferous white-flowered spring-blooming woodland plant | Synonyms: coolwart, false miterwort, false mitrewort, Tiarella cordifolia |
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| fodder | (noun) coarse food (especially for livestock) composed of entire plants or the leaves and stalks of a cereal crop | - |
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| (noun) soldiers who are regarded as expendable in the face of artillery fire | Synonyms: cannon fodder, fresh fish |
| (verb) give fodder (to domesticated animals) | - |
| folder | (noun) covering that is folded over to protect the contents | - |
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| (noun) a small book usually having a paper cover | Synonyms: booklet, brochure, leaflet, pamphlet |
| follower | (noun) a person who accepts the leadership of another | - |
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| (noun) someone who travels behind or pursues another | - |
| fomenter | (noun) one who agitates; a political troublemaker | Synonyms: agitator |
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| fondler | (noun) a lover who gently fondles and caresses the loved one | Synonyms: petter |
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| (noun) a molester who touches the intimate parts of the victim | - |
| footballer | (noun) an athlete who plays American football | Synonyms: football player |
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| footer | (noun) a printed note placed below the text on a printed page | Synonyms: footnote |
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| (noun) a person who travels by foot | Synonyms: pedestrian, walker |
| (noun) (used only in combinations) the height or length of something in feet | - |
| footlocker | (noun) a trunk for storing personal possessions; usually kept at the foot of a bed (as in a barracks) | Synonyms: locker |
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| footslogger | (noun) fights on foot with small arms | Synonyms: foot soldier, infantryman, marcher |
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| forager | (noun) someone who hunts for food and provisions | - |
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| foraminifer | (noun) marine microorganism having a calcareous shell with openings where pseudopods protrude | Synonyms: foram |
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| forecaster | (noun) someone who makes predictions of the future (usually on the basis of special knowledge) | Synonyms: predictor, prognosticator, soothsayer |
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| forefather | (noun) the founder of a family | Synonyms: father, sire |
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| (noun) person from an earlier time who contributed to the tradition shared by some group | - |
| forefinger | (noun) the finger next to the thumb | Synonyms: index, index finger |
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| foregather | (verb) collect in one place | Synonyms: assemble, forgather, gather, meet |
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| foreigner | (noun) a person who comes from a foreign country; someone who does not owe allegiance to your country | Synonyms: alien, noncitizen, outlander |
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| (noun) someone who is excluded from or is not a member of a group | Synonyms: outsider |
| foremother | (noun) a female ancestor | - |
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| forequarter | (noun) the front half of a side of meat | - |
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| forerunner | (noun) something that precedes and indicates the approach of something or someone | Synonyms: harbinger, herald, precursor, predecessor |
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| (noun) a person who goes before or announces the coming of another | Synonyms: precursor |
| (noun) anything that precedes something similar in time | Synonyms: antecedent |
| forester | (noun) someone trained in forestry | Synonyms: arboriculturist, tree farmer |
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| forever | (adverb) for a limitless time | Synonyms: eternally, everlastingly, evermore |
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| (adverb) for a very long or seemingly endless time | Synonyms: forever and a day |
| (adverb) invariably | Synonyms: always, constantly, incessantly, perpetually |
| forgather | (verb) collect in one place | Synonyms: assemble, foregather, gather, meet |
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| forger | (noun) someone who operates a forge | - |
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| (noun) someone who makes copies illegally | Synonyms: counterfeiter |
| forgiver | (noun) a person who pardons or forgives or excuses a fault or offense | Synonyms: excuser, pardoner |
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| former | (adjective) referring to the first of two things or persons mentioned (or the earlier one or ones of several) | - |
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| (adjective) belonging to the distant past | Synonyms: early, other |
| (adjective) belonging to some prior time | Synonyms: erstwhile, old, one-time, onetime, quondam, sometime |
| (adjective) (used especially of persons) of the immediate past | Synonyms: late, previous |
| (noun) the first of two or the first mentioned of two | - |
| forrader | (adverb) in a forward direction | Synonyms: ahead, forward, forwards, onward, onwards |
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| fortuneteller | (noun) a person who foretells your personal future | Synonyms: fortune teller |
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| foster | (adjective) providing or receiving nurture or parental care though not related by blood or legal ties | Synonyms: surrogate |
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| (verb) help develop, help grow | Synonyms: nurture |
| (verb) promote the growth of | Synonyms: cultivate, further |
| (verb) bring up under fosterage; of children | - |
| founder | (noun) a person who founds or establishes some institution | Synonyms: beginner, father, founding father |
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| (noun) a worker who makes metal castings | - |
| (noun) inflammation of the laminated tissue that attaches the hoof to the foot of a horse | Synonyms: laminitis |
| (verb) break down, literally or metaphorically | Synonyms: break, cave in, collapse, fall in, give, give way |
| (verb) sink below the surface | - |
| (verb) stumble and nearly fall | - |
| (verb) fail utterly; collapse | Synonyms: fall flat, fall through, flop |
| fowler | (noun) someone who hunts wild birds for food | - |
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| foyer | (noun) a large entrance or reception room or area | Synonyms: antechamber, anteroom, entrance hall, hall, lobby, vestibule |
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| framer | (noun) someone who writes a new law or plan | - |
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| (noun) someone who makes frames (as for pictures) | - |
| frankfurter | (noun) a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll | Synonyms: dog, frank, hot dog, hotdog, weenie, wiener, wienerwurst |
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| freebooter | (noun) someone who takes spoils or plunder (as in war) | Synonyms: despoiler, looter, pillager, plunderer, raider, spoiler |
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| freeholder | (noun) the owner of a freehold | - |
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| freelancer | (noun) a writer or artist who sells services to different employers without a long-term contract with any of them | Synonyms: free-lance, free lance, freelance, independent, self-employed person |
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| freeloader | (noun) someone who takes advantage of the generosity of others | - |
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| freethinker | (noun) a person who rejects religion | - |
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| freewheeler | (noun) someone acting freely or even irresponsibly | Synonyms: free agent, free spirit |
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| freezer | (noun) electric refrigerator (trade name Deepfreeze) in which food is frozen and stored for long periods of time | Synonyms: deep-freeze, deep freezer, Deepfreeze |
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| freighter | (noun) a cargo ship | Synonyms: bottom, merchant ship, merchantman |
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| frequenter | (noun) a regular customer | Synonyms: patron |
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| freshener | (noun) anything that freshens | - |
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| fresher | (noun) a first-year undergraduate | Synonyms: freshman |
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| freshwater | (noun) water that is not salty | Synonyms: fresh water |
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| frier | (noun) A kitchen appliance for deep frying; its size depends on intended use. | Synonyms: deep fat fryer, deep fryer, fryer, fryolator |
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| (noun) flesh of a medium-sized young chicken suitable for frying | Synonyms: fryer, pullet |
| fritter | (noun) small quantity of fried batter containing fruit or meat or vegetables | - |
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| (verb) spend frivolously and unwisely | Synonyms: dissipate, fool, fool away, fritter away, frivol away, shoot |
| froghopper | (noun) a variety of spittlebug | - |
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| frontbencher | (noun) a member of the House of Commons who is a minister in the government or who holds an official position in an opposition party | - |
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| frontier | (noun) an undeveloped field of study; a topic inviting research and development | - |
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| (noun) a wilderness at the edge of a settled area of a country | - |
| (noun) an international boundary or the area (often fortified) immediately inside the boundary | - |
| fruiterer | (noun) a person who sells fruit | - |
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| fryer | (noun) A kitchen appliance for deep frying; its size depends on intended use. | Synonyms: deep fat fryer, deep fryer, frier, fryolator |
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| (noun) flesh of a medium-sized young chicken suitable for frying | Synonyms: frier, pullet |
| fucker | (noun) a stupid despised man | - |
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| fuller | (noun) a workman who fulls (cleans and thickens) freshly woven cloth for a living | - |
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| fumbler | (noun) someone who makes mistakes because of incompetence | Synonyms: blunderer, botcher, bumbler, bungler, butcher, fuckup, sad sack, stumbler |
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| fundraiser | (noun) a social function that is held for the purpose of raising money | - |
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| (noun) someone who solicits financial contributions | - |
| furrier | (noun) someone whose occupation is making or repairing fur garments | Synonyms: cloakmaker |
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| further | (adjective) more distant in especially degree | Synonyms: farther |
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| (adverb) to or at a greater distance in time or space (`farther' is used more frequently than `further' in this physical sense) | Synonyms: farther |
| (adverb) to or at a greater extent or degree or a more advanced stage (`further' is used more often than `farther' in this abstract sense) | Synonyms: farther |
| (adverb) in addition or furthermore | - |
| (verb) contribute to the progress or growth of | Synonyms: advance, boost, encourage, promote |
| (verb) promote the growth of | Synonyms: cultivate, foster |
| fusilier | (noun) (formerly) a British infantryman armed with a light flintlock musket | - |
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| gadgeteer | (noun) a person who delights in designing or building or using gadgets | - |
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| gaffer | (noun) a person who exercises control over workers | Synonyms: boss, chief, foreman, honcho |
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| (noun) an elderly man | Synonyms: antique, old-timer, old geezer, oldtimer |
| (noun) an electrician responsible for lighting on a movie or tv set | - |
| gagster | (noun) someone who writes comic material for public performers | Synonyms: gagman, gagwriter |
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| gagwriter | (noun) someone who writes comic material for public performers | Synonyms: gagman, gagster |
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