| four | (noun) a playing card or domino or die whose upward face shows four pips | Synonyms: four-spot |
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| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| fourpence | (noun) a former English silver coin worth four pennies | Synonyms: groat |
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| fourscore | (noun) the cardinal number that is the product of ten and eight | Synonyms: 80, eighty, LXXX |
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| foursome | (noun) four people considered as a unit | Synonyms: quartet, quartette |
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| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| foursquare | (noun) (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon | Synonyms: square |
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| fourteen | (noun) the cardinal number that is the sum of thirteen and one | Synonyms: 14, XIV |
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| fourteenth | (noun) position 14 in a countable series of things | - |
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| fourth | (noun) the musical interval between one note and another four notes away from it | - |
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| (noun) one of four equal parts | Synonyms: fourth part, one-fourth, one-quarter, quarter, quartern, twenty-five percent |
| (noun) following the third position; number four in a countable series | - |
| fovea | (noun) area consisting of a small depression in the retina containing cones and where vision is most acute | Synonyms: fovea centralis |
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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 |
| fowler | (noun) someone who hunts wild birds for food | - |
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| fox | (noun) alert carnivorous mammal with pointed muzzle and ears and a bushy tail; most are predators that do not hunt in packs | - |
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| (noun) a shifty deceptive person | Synonyms: dodger, slyboots |
| (noun) the grey or reddish-brown fur of a fox | - |
| foxberry | (noun) low evergreen shrub of high north temperate regions of Europe and Asia and America bearing red edible berries | Synonyms: cowberry, lingberry, lingenberry, lingonberry, mountain cranberry, Vaccinium vitis-idaea |
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| foxglove | (noun) any of several plants of the genus Digitalis | Synonyms: digitalis |
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| foxhole | (noun) a small dugout with a pit for individual shelter against enemy fire | Synonyms: fox hole |
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| foxhound | (noun) medium-sized glossy-coated hounds developed for hunting foxes | - |
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| foxhunt | (noun) mounted hunters follow hounds in pursuit of a fox | Synonyms: fox hunting |
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| foxiness | (noun) shrewdness as demonstrated by being skilled in deception | Synonyms: craft, craftiness, cunning, guile, slyness, wiliness |
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| foxtail | (noun) grasses of the genera Alopecurus and Setaria having dense silky or bristly brushlike flowering spikes | Synonyms: foxtail grass |
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| foxtrot | (noun) a ballroom dance in quadruple time; combines short and long and fast and slow steps fixed sequences | Synonyms: fox-trot |
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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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