| fief | (noun) a piece of land held under the feudal system | Synonyms: feoff |
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| fiefdom | (noun) an organization that is controlled by a dominant person or group | - |
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| (noun) the domain controlled by a feudal lord | - |
| field | (noun) a particular kind of commercial enterprise | Synonyms: field of operation, line of business |
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| (noun) a place where planes take off and land | Synonyms: airfield, flying field, landing field |
| (noun) a branch of knowledge | Synonyms: bailiwick, discipline, field of study, study, subject, subject area, subject field |
| (noun) the area that is visible (as through an optical instrument) | Synonyms: field of view |
| (noun) (mathematics) a set of elements such that addition and multiplication are commutative and associative and multiplication is distributive over addition and there are two elements 0 and 1 | - |
| (noun) all of the horses in a particular horse race | - |
| (noun) all the competitors in a particular contest or sporting event | - |
| (noun) (computer science) a set of one or more adjacent characters comprising a unit of information | - |
| (noun) a piece of land cleared of trees and usually enclosed | - |
| (noun) somewhere (away from a studio or office or library or laboratory) where practical work is done or data is collected | - |
| (noun) a piece of land prepared for playing a game | Synonyms: athletic field, playing area, playing field |
| (noun) a region in which active military operations are in progress | Synonyms: field of operations, theater, theater of operations, theatre, theatre of operations |
| (noun) a region where a battle is being (or has been) fought | Synonyms: battlefield, battleground, field of battle, field of honor |
| (noun) a geographic region (land or sea) under which something valuable is found | - |
| (noun) extensive tract of level open land | Synonyms: champaign, plain |
| (noun) the space around a radiating body within which its electromagnetic oscillations can exert force on another similar body not in contact with it | Synonyms: field of force, force field |
| (noun) a particular environment or walk of life | Synonyms: area, arena, domain, orbit, sphere |
| (verb) select (a team or individual player) for a game | - |
| (verb) answer adequately or successfully | - |
| (verb) play as a fielder | - |
| (verb) catch or pick up (balls) in baseball or cricket | - |
| fielder | (noun) a member of the baseball team that is in the field instead of at bat | - |
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| (noun) a member of the cricket team that is fielding rather than batting | Synonyms: fieldsman |
| fieldfare | (noun) medium-sized Eurasian thrush seen chiefly in winter | Synonyms: snowbird, Turdus pilaris |
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| fieldhand | (noun) a hired hand on a farm | Synonyms: farm worker, farmhand, field hand |
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| fielding | (noun) (baseball) handling the ball while playing in the field | - |
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| fieldmouse | (noun) any nocturnal Old World mouse of the genus Apodemus inhabiting woods and fields and gardens | Synonyms: field mouse |
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| fieldsman | (noun) a member of the cricket team that is fielding rather than batting | Synonyms: fielder |
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| fieldstone | (noun) stone that occurs naturally in fields; often used as building material | - |
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| fieldwork | (noun) a temporary fortification built by troops in the field | - |
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| fieldworker | (noun) a researcher who works in the field | - |
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| fiend | (noun) a cruel wicked and inhuman person | Synonyms: demon, devil, monster, ogre |
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| (noun) a person motivated by irrational enthusiasm (as for a cause) | Synonyms: fanatic |
| (noun) an evil supernatural being | Synonyms: daemon, daimon, demon, devil |
| fiendish | (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, hellish, infernal, satanic, unholy |
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| fiendishly | (adverb) as a devil; in an evil manner | Synonyms: devilishly, diabolically |
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| fierce | (adjective) marked by extreme intensity of emotions or convictions; inclined to react violently; fervid | Synonyms: tearing, trigger-happy, vehement, violent |
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| (adjective) ruthless in competition | Synonyms: bowelless, cutthroat |
| (adjective) violently agitated and turbulent | Synonyms: boisterous, rough |
| (adjective) marked by extreme and violent energy | Synonyms: ferocious, furious, savage |
| fiercely | (adverb) in a physically fierce manner | Synonyms: ferociously |
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| (adverb) in an emotionally fierce manner | - |
| fierceness | (noun) the property of being wild or turbulent | Synonyms: ferocity, furiousness, fury, vehemence, violence, wildness |
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| fierily | (adverb) with passionate fervor | Synonyms: fervently, fervidly |
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| fieriness | (noun) the heat or the color of fire | Synonyms: red heat |
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| (noun) a passionate and quick-tempered nature | - |
| fiery | (adjective) like or suggestive of fire | Synonyms: igneous |
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| (adjective) passionate or quick-tempered | Synonyms: flaming |
| (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, impassioned, perfervid, torrid |
| fiesta | (noun) an elaborate party (often outdoors) | Synonyms: feast, fete |
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