| fill | (noun) a quantity sufficient to satisfy | - |
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| (noun) any material that fills a space or container | Synonyms: filling |
| final | (noun) an examination administered at the end of an academic term | Synonyms: final exam, final examination |
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| (noun) the final match between the winners of all previous matches in an elimination tournament | - |
| fingernail | (noun) the nail at the end of a finger | - |
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| fingerstall | (noun) a sheath worn to protect a finger | Synonyms: cot |
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| finial | (noun) an ornament at the top of a spire or gable; usually a foliated fleur-de-lis | - |
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| fireball | (noun) the luminous center of a nuclear explosion | - |
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| (noun) a ball of fire (such as the sun or a ball-shaped discharge of lightning) | - |
| (noun) a highly energetic and indefatigable person | Synonyms: ball of fire, human dynamo, powerhouse |
| (noun) an especially luminous meteor (sometimes exploding) | Synonyms: bolide |
| firewall | (noun) (colloquial) the application of maximum thrust | - |
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| (noun) a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle | - |
| (noun) (computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet | - |
| fishbowl | (noun) a transparent bowl in which small fish are kept | Synonyms: fish bowl, goldfish bowl |
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| (noun) a state of affairs in which you have no privacy | Synonyms: fish bowl, goldfish bowl |
| fistful | (noun) the quantity that can be held in the hand | Synonyms: handful |
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| flail | (noun) an implement consisting of handle with a free swinging stick at the end; used in manual threshing | - |
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| flannel | (noun) a soft light woolen fabric; used for clothing | - |
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| (noun) bath linen consisting of a piece of cloth used to wash the face and body | Synonyms: face cloth, washcloth, washrag |
| (noun) (usually in the plural) trousers made of flannel or gabardine or tweed or white cloth | Synonyms: gabardine, tweed, white |
| flaskful | (noun) the quantity a flask will hold | Synonyms: flask |
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| flickertail | (noun) of sagebrush and grassland areas of western United States and Canada | Synonyms: Citellus richardsoni, Richardson ground squirrel |
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| fluorouracil | (noun) an antimetabolite used to treat certain cancers | - |
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| flywheel | (noun) regulator consisting of a heavy wheel that stores kinetic energy and smooths the operation of a reciprocating engine | - |
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| foal | (noun) a young horse | - |
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| fogsignal | (noun) a loud low warning signal that can be heard by fogbound ships | Synonyms: foghorn |
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| foil | (noun) a light slender flexible sword tipped by a button | - |
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| (noun) a piece of thin and flexible sheet metal | - |
| (noun) picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector | Synonyms: transparency |
| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: hydrofoil |
| (noun) anything that serves by contrast to call attention to another thing's good qualities | Synonyms: enhancer |
| folderal | (noun) ornamental objects of no great value | Synonyms: falderol, frill, gimcrack, gimcrackery, nonsense, trumpery |
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| folderol | (noun) nonsensical talk or writing | Synonyms: applesauce, codswallop, rubbish, trash, tripe, trumpery, wish-wash |
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| fontanel | (noun) any membranous gap between the bones of the cranium in an infant or fetus | Synonyms: fontanelle, soft spot |
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| fool | (noun) a person who lacks good judgment | Synonyms: muggins, sap, saphead, tomfool |
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| (noun) a person who is gullible and easy to take advantage of | Synonyms: chump, fall guy, gull, mark, mug, patsy, soft touch, sucker |
| (noun) a professional clown employed to entertain a king or nobleman in the Middle Ages | Synonyms: jester, motley fool |
| football | (noun) any of various games played with a ball (round or oval) in which two teams try to kick or carry or propel the ball into each other's goal | Synonyms: football game |
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| (noun) the inflated oblong ball used in playing American football | - |
| footfall | (noun) the sound of a step of someone walking | Synonyms: footstep, step |
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| foothill | (noun) a relatively low hill on the lower slope of a mountain | - |
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| footstall | (noun) an architectural support or base (as for a column or statue) | Synonyms: pedestal, plinth |
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| footstool | (noun) a low seat or a stool to rest the feet of a seated person | Synonyms: footrest, ottoman, tuffet |
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| footwall | (noun) the lower wall of an inclined fault | - |
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| foresail | (noun) the lowest sail on the foremast of a square-rigged vessel | - |
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| formal | (noun) a gown for evening wear | Synonyms: dinner dress, dinner gown, evening gown |
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| (noun) a lavish dance requiring formal attire | Synonyms: ball |
| formol | (noun) a 10% solution of formaldehyde in water; used as a disinfectant or to preserve biological specimens | Synonyms: formalin |
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| foryml | (noun) (chemistry) the negative univalent acyl radical CHO that occurs in aldehydes | - |
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| fossil | (noun) the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil | - |
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| (noun) someone whose style is out of fashion | Synonyms: dodo, fogey, fogy |
| foul | (noun) an act that violates the rules of a sport | - |
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| fowl | (noun) a domesticated gallinaceous bird thought to be descended from the red jungle fowl | Synonyms: domestic fowl, poultry |
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| (noun) the flesh of a bird or fowl (wild or domestic) used as food | Synonyms: bird |
| foxtail | (noun) grasses of the genera Alopecurus and Setaria having dense silky or bristly brushlike flowering spikes | Synonyms: foxtail grass |
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| fractal | (noun) (mathematics) a geometric pattern that is repeated at every scale and so cannot be represented by classical geometry | - |
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| frail | (noun) a basket for holding dried fruit (especially raisins or figs) | - |
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| (noun) the weight of a frail (basket) full of raisins or figs; between 50 and 75 pounds | - |
| freemail | (noun) a service providing free email delivery in exchange for exposure to advertising | - |
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| freetail | (noun) small swift insectivorous bat with leathery ears and a long tail; common in warm regions | Synonyms: free-tailed bat, freetailed bat |
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| freewheel | (noun) a clutch (as on the rear wheel of a bicycle) that allows wheels to turn freely (as in coasting) | - |
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| frijol | (noun) the common bean plant grown for the beans rather than the pods (especially a variety with large red kidney-shaped beans) | Synonyms: frijole, kidney bean |
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| frill | (noun) a strip of pleated material used as a decoration or a trim | Synonyms: flounce, furbelow, ruffle |
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| (noun) ornamental objects of no great value | Synonyms: falderol, folderal, gimcrack, gimcrackery, nonsense, trumpery |
| (noun) an external body part consisting of feathers or hair about the neck of a bird or other animal | Synonyms: ruff |
| (noun) (paleontology) a bony plate that curves upward behind the skull of many ceratopsian dinosaurs | - |
| frontal | (noun) an adornment worn on the forehead | Synonyms: frontlet |
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| (noun) a drapery that covers the front of an altar | - |
| (noun) the face or front of a building | Synonyms: facade, frontage |
| frontstall | (noun) medieval plate armor to protect a horse's head | Synonyms: chamfron, chanfron, front-stall, testiere |
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| fuel | (noun) a substance that can be consumed to produce energy | - |
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| full | (noun) the time when the Moon is fully illuminated | Synonyms: full-of-the-moon, full moon, full phase of the moon |
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| fundamental | (noun) the lowest tone of a harmonic series | Synonyms: first harmonic, fundamental frequency |
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| (noun) any factor that could be considered important to the understanding of a particular business | - |
| funeral | (noun) a ceremony at which a dead person is buried or cremated | Synonyms: obsequy |
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| funnel | (noun) (nautical) smokestack consisting of a shaft for ventilation or the passage of smoke (especially the smokestack of a ship) | - |
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| (noun) a conically shaped utensil having a narrow tube at the small end; used to channel the flow of substances into a container with a small mouth | - |
| (noun) a conical shape with a wider and a narrower opening at the two ends | Synonyms: funnel shape |
| furfural | (noun) a liquid aldehyde with a penetrating odor; made from plant hulls and corncobs; used in making furan and as a solvent | Synonyms: furfuraldehyde |
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| fusil | (noun) a light flintlock musket | - |
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| gaffsail | (noun) a quadrilateral fore-and-aft sail suspended from a gaff | Synonyms: gaff-headed sail |
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| gal | (noun) alliterative term for girl (or woman) | - |
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| (noun) United States liquid unit equal to 4 quarts or 3.785 liters | Synonyms: gallon |
| (noun) a unit of gravitational acceleration equal to one centimeter per second per second (named after Galileo) | - |
| galangal | (noun) southeastern Asian perennial with aromatic roots | Synonyms: Alpinia galanga |
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| (noun) European sedge having rough-edged leaves and spikelets of reddish flowers and aromatic roots | Synonyms: Cyperus longus, galingale |
| gall | (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, impertinence, impudence, insolence |
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| (noun) a digestive juice secreted by the liver and stored in the gallbladder; aids in the digestion of fats | Synonyms: bile |
| (noun) a feeling of deep and bitter anger and ill-will | Synonyms: bitterness, rancor, rancour, resentment |
| (noun) abnormal swelling of plant tissue caused by insects or microorganisms or injury | - |
| (noun) a skin sore caused by chafing | - |
| (noun) an open sore on the back of a horse caused by ill-fitting or badly adjusted saddle | Synonyms: saddle sore |
| gambol | (noun) gay or light-hearted recreational activity for diversion or amusement | Synonyms: caper, frolic, play, romp |
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| gambrel | (noun) a gable roof with two slopes on each side and the lower slope being steeper | Synonyms: gambrel roof |
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| gaol | (noun) a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence) | Synonyms: clink, jail, jailhouse, pokey, poky, slammer |
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| garboil | (noun) a state of commotion and noise and confusion | Synonyms: tumult, tumultuousness, uproar |
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| gasohol | (noun) a gasoline substitute consisting of 90% gasoline and 10% grain alcohol from corn | - |
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| gavel | (noun) a small mallet used by a presiding officer or a judge | - |
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| gavial | (noun) large fish-eating Indian crocodilian with a long slender snout | Synonyms: Gavialis gangeticus |
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| gayal | (noun) ox of southeast Asia sometimes considered a domesticated breed of the gaur | Synonyms: Bibos frontalis, mithan |
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| gel | (noun) a thin translucent membrane used over stage lights for color effects | Synonyms: gelatin |
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| (noun) jellylike substance used in hair styling | Synonyms: hair gel |
| (noun) a colloid in a more solid form than a sol | Synonyms: colloidal gel |
| gemfibrozil | (noun) medication (trade name Lopid) used to lower the levels of triglyceride in the blood | Synonyms: Lopid |
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| general | (noun) a fact about the whole (as opposed to particular) | - |
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| (noun) a general officer of the highest rank | Synonyms: full general |
| (noun) the head of a religious order or congregation | Synonyms: superior general |
| gerbil | (noun) small Old World burrowing desert rodent with long soft pale fur and hind legs adapted for leaping | Synonyms: gerbille |
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| ghoul | (noun) an evil spirit or ghost | - |
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| (noun) someone who takes bodies from graves and sells them for anatomical dissection | Synonyms: body snatcher, graverobber |
| gildhall | (noun) the meeting place of a medieval guild | - |
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| gill | (noun) respiratory organ of aquatic animals that breathe oxygen dissolved in water | Synonyms: branchia |
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| (noun) any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus | Synonyms: lamella |
| (noun) a United States liquid unit equal to 4 fluid ounces | - |
| (noun) a British imperial capacity unit (liquid or dry) equal to 5 fluid ounces or 142.066 cubic centimeters | - |
| gimbal | (noun) an appliance that allows an object (such as a ship's compass) to remain horizontal even as its support tips | - |
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| gimel | (noun) the 3rd letter of the Hebrew alphabet | - |
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| gingerol | (noun) derived from ginger; source of the hotness of ginger | - |
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| ginmill | (noun) a room or establishment where alcoholic drinks are served over a counter | Synonyms: bar, barroom, saloon, taproom |
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| girasol | (noun) tall perennial with hairy stems and leaves; widely cultivated for its large irregular edible tubers | Synonyms: Helianthus tuberosus, Jerusalem artichoke, Jerusalem artichoke sunflower |
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| (noun) an opal with flaming orange and yellow and red colors | Synonyms: fire opal |
| girl | (noun) a young female | Synonyms: fille, miss, missy, young lady, young woman |
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| (noun) a girl or young woman with whom a man is romantically involved | Synonyms: girlfriend, lady friend |
| (noun) a youthful female person | Synonyms: female child, little girl |
| (noun) a friendly informal reference to a grown woman | - |
| (noun) a female human offspring | Synonyms: daughter |
| glassful | (noun) the quantity a glass will hold | Synonyms: glass |
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| glockenspiel | (noun) a percussion instrument consisting of a set of graduated metal bars mounted on a frame and played with small hammers | Synonyms: orchestral bells |
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| glycerogel | (noun) a medicated skin preparation made from glycerin and glycerinated gelatin | Synonyms: glycerogelatin |
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| glycerol | (noun) a sweet syrupy trihydroxy alcohol obtained by saponification of fats and oils | Synonyms: glycerin, glycerine |
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| glyceryl | (noun) a trivalent radical derived from glycerol by removing the three hydroxyl radicals | - |
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| glycol | (noun) any of a class of alcohols having 2 hydroxyl groups in each molecule | Synonyms: dihydric alcohol, diol |
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| (noun) a sweet but poisonous syrupy liquid used as an antifreeze and solvent | Synonyms: ethanediol, ethylene glycol |
| gnarl | (noun) something twisted and tight and swollen | Synonyms: knot |
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| goal | (noun) a successful attempt at scoring | - |
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| (noun) game equipment consisting of the place toward which players of a game try to advance a ball or puck in order to score points | - |
| (noun) the state of affairs that a plan is intended to achieve and that (when achieved) terminates behavior intended to achieve it | Synonyms: end |
| (noun) the place designated as the end (as of a race or journey) | Synonyms: destination, finish |
| goldenseal | (noun) perennial herb of northeastern United States having a thick knotted yellow rootstock and large rounded leaves | Synonyms: golden seal, Hydrastis Canadensis, turmeric root, yellow root |
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| goodwill | (noun) a disposition to kindness and compassion | Synonyms: good will, grace |
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| (noun) the friendly hope that something will succeed | Synonyms: good will |
| (noun) (accounting) an intangible asset valued according to the advantage or reputation a business has acquired (over and above its tangible assets) | Synonyms: good will |
| goofball | (noun) a man who is a stupid incompetent fool | Synonyms: bozo, cuckoo, fathead, goof, goose, jackass, twat, zany |
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| (noun) a person who amuses others by ridiculous behavior | Synonyms: buffoon, clown, goof, merry andrew |
| googol | (noun) a cardinal number represented as 1 followed by 100 zeros (ten raised to the power of a hundred) | - |
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| goral | (noun) small goat antelope with small conical horns; of southern Asian mountains | Synonyms: Naemorhedus goral |
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| gospel | (noun) a doctrine that is believed to be of great importance | - |
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| (noun) the written body of teachings of a religious group that are generally accepted by that group | Synonyms: church doctrine, creed, religious doctrine |
| (noun) an unquestionable truth | Synonyms: gospel truth |
| (noun) folk music consisting of a genre of a cappella music originating with Black slaves in the United States and featuring call and response; influential on the development of other genres of popular music (especially soul) | Synonyms: gospel singing |
| gradual | (noun) (Roman Catholic Church) an antiphon (usually from the Book of Psalms) immediately after the epistle at Mass | - |
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| grail | (noun) (legend) chalice used by Christ at the Last Supper | Synonyms: Holy Grail, Sangraal |
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| (noun) the object of any prolonged endeavor | - |
| grapnel | (noun) a light anchor for small boats | Synonyms: grapnel anchor |
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| (noun) a tool consisting of several hooks for grasping and holding; often thrown with a rope | Synonyms: grapple, grappler, grappling hook, grappling iron |
| gravel | (noun) rock fragments and pebbles | Synonyms: crushed rock |
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| greaseball | (noun) (ethnic slur) offensive term for a person of Italian descent | Synonyms: dago, ginzo, Guinea, wop |
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| greenmail | (noun) (corporation) the practice of purchasing enough shares in a firm to threaten a takeover and thereby forcing the owners to buy those shares back at a premium in order to stay in business | - |
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| grill | (noun) a framework of metal bars used as a partition or a grate | Synonyms: grille, grillwork |
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| (noun) a restaurant where food is cooked on a grill | Synonyms: grillroom |
| gristmill | (noun) a mill for grinding grain (especially the customer's own grain) | - |
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| groenendael | (noun) black-coated sheepdog with a heavily plumed tail | - |
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