| errand | (noun) a short trip that is taken in the performance of a necessary task or mission | - |
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| ethmoid | (noun) one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity | Synonyms: ethmoid bone |
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| euglenid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenoid, euglenophyte |
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| euglenoid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenid, euglenophyte |
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| euronithopod | (noun) widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon) | Synonyms: Euronithopoda, Ornithopoda, suborder Euronithopoda, suborder Ornithopoda |
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| eurypterid | (noun) large extinct scorpion-like arthropod considered related to horseshoe crabs | - |
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| eyelid | (noun) either of two folds of skin that can be moved to cover or open the eye | Synonyms: lid, palpebra |
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| ezed | (noun) the 26th letter of the Roman alphabet | Synonyms: izzard, Z, z, zed, zee |
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| factoid | (noun) a brief (usually one sentence and usually trivial) news item | - |
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| (noun) something resembling a fact; unverified (often invented) information that is given credibility because it appeared in print | - |
| fad | (noun) an interest followed with exaggerated zeal | Synonyms: craze, cult, furor, furore, rage |
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| fairground | (noun) an open area for holding fairs or exhibitions or circuses | - |
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| fairlead | (noun) a pulley-block used to guide a rope forming part of a ship's rigging to avoid chafing | - |
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| fairyland | (noun) something existing solely in the imagination (but often mistaken for reality) | Synonyms: fantasy world, phantasy world |
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| (noun) the enchanted realm of fairies | Synonyms: faerie, faery |
| fallboard | (noun) the hinged protective covering that protects the keyboard of a piano when it is not being played | Synonyms: fall-board |
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| falsehood | (noun) the act of rendering something false as by fraudulent changes (of documents or measures etc.) or counterfeiting | Synonyms: falsification |
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| (noun) a false statement | Synonyms: falsity, untruth |
| fanweed | (noun) foetid Eurasian weed having round flat pods; naturalized throughout North America | Synonyms: field pennycress, French weed, mithridate mustard, penny grass, stinkweed, Thlaspi arvense |
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| farad | (noun) the capacitance of a capacitor that has an equal and opposite charge of 1 coulomb on each plate and a voltage difference of 1 volt between the plates | Synonyms: F |
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| farmhand | (noun) a hired hand on a farm | Synonyms: farm worker, field hand, fieldhand |
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| farmland | (noun) a rural area where farming is practiced | Synonyms: farming area |
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| (noun) arable land that is worked by plowing and sowing and raising crops | Synonyms: cultivated land, ploughland, plowland, tillage, tilled land, tilth |
| farmstead | (noun) a farm together with its buildings | Synonyms: farm-place, farmplace |
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| (noun) the buildings and adjacent grounds of a farm | - |
| farmyard | (noun) an area adjacent to farm buildings | - |
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| fathead | (noun) a man who is a stupid incompetent fool | Synonyms: bozo, cuckoo, goof, goofball, goose, jackass, twat, zany |
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| fatherhood | (noun) the status of a father | - |
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| (noun) the status of a religious leader | - |
| (noun) the kinship relation between an offspring and the father | Synonyms: paternity |
| fatherland | (noun) the country where you were born | Synonyms: country of origin, homeland, mother country, motherland, native land |
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| fauld | (noun) a piece of armor plate below the breastplate | - |
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| featherbed | (noun) a mattress stuffed with feathers | Synonyms: feather bed |
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| feed | (noun) food for domestic livestock | Synonyms: provender |
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| felid | (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: feline |
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| femtosecond | (noun) one quadrillionth (10^-15) of a second; one thousandth of a picosecond | - |
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| fenland | (noun) low-lying wet land with grassy vegetation; usually is a transition zone between land and water | Synonyms: fen, marsh, marshland |
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| feud | (noun) a bitter quarrel between two parties | - |
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| fiberboard | (noun) wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets | Synonyms: fibreboard, particle board |
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| fibreboard | (noun) wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets | Synonyms: fiberboard, particle board |
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| fibroid | (noun) benign tumor containing fibrous tissue (especially in the uterus) | Synonyms: fibroid tumor |
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| fiddlehead | (noun) New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds; the early uncurling fronds are edible | Synonyms: cinnamon fern, fiddlehead fern, Osmunda cinnamonea |
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| (noun) tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes | Synonyms: Matteuccia struthiopteris, Onoclea struthiopteris, ostrich fern, Pteretis struthiopteris, shuttlecock fern |
| 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 |
| fieldhand | (noun) a hired hand on a farm | Synonyms: farm worker, farmhand, field hand |
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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 |
| figurehead | (noun) figure on the bow of some sailing vessels | - |
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| (noun) a person used as a cover for some questionable activity | Synonyms: front, front man, nominal head, straw man, strawman |
| find | (noun) the act of discovering something | Synonyms: discovery, uncovering |
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| (noun) a productive insight | Synonyms: breakthrough, discovery |
| fingerboard | (noun) a narrow strip of wood on the neck of some stringed instruments (violin or cello or guitar etc) where the strings are held against the wood with the fingers | - |
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| (noun) a bank of keys on a musical instrument | Synonyms: clavier, piano keyboard |
| (noun) a guidepost resembling a hand with a pointing index finger | Synonyms: fingerpost |
| fiord | (noun) a long narrow inlet of the sea between steep cliffs; common in Norway | Synonyms: fjord |
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| firebird | (noun) eastern subspecies of northern oriole | Synonyms: Baltimore bird, Baltimore oriole, hangbird, Icterus galbula galbula |
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| (noun) the male is bright red with black wings and tail | Synonyms: Piranga olivacea, redbird, scarlet tanager |
| (noun) tropical American flycatcher found as far north as southern Texas and Arizona; adult male has bright scarlet and black plumage | Synonyms: Pyrocephalus rubinus mexicanus, vermillion flycatcher |
| firebrand | (noun) someone who deliberately foments trouble | Synonyms: inciter, instigant, instigator, provoker |
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| (noun) a piece of wood that has been burned or is burning | Synonyms: brand |
| fireguard | (noun) a metal screen before an open fire for protection (especially against flying sparks) | Synonyms: fire screen |
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| (noun) a narrow field that has been cleared to check the spread of a prairie fire or forest fire | Synonyms: firebreak |
| fireweed | (noun) tall North American perennial with creeping rootstocks and narrow leaves and spikes of pinkish-purple flowers occurring in great abundance in burned-over areas or recent clearings; an important honey plant | Synonyms: Epilobium angustifolium, giant willowherb, rosebay willowherb, wickup |
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| (noun) an American weedy plant with small white or greenish flowers | Synonyms: Erechtites hieracifolia |
| firewood | (noun) wood used for fuel | - |
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| fishpond | (noun) a freshwater pond with fish | - |
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| fissiped | (noun) terrestrial carnivores having toes separated to the base: dogs, cats, bears, badgers, raccoons | Synonyms: fissiped mammal |
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| fjord | (noun) a long narrow inlet of the sea between steep cliffs; common in Norway | Synonyms: fiord |
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| flashboard | (noun) boarding place along the top of a dam to increase its height | Synonyms: flashboarding |
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| flashcard | (noun) a card with words or numbers or pictures that is flashed to a class by the teacher | Synonyms: flash card |
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| flashflood | (noun) a sudden local flood of great volume and short duration | Synonyms: flash flood |
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| flatbed | (noun) an open truck bed or trailer with no sides; used to carry large heavy objects | - |
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| (noun) freight car without permanent sides or roof | Synonyms: flat, flatcar |
| flatbread | (noun) any of various breads made from usually unleavened dough | - |
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| flatbrod | (noun) the thin wafer-like bread of Scandinavia | - |
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| flathead | (noun) food fish of the Indonesian region of the Pacific; resembles gurnards | - |
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| (noun) pallid bottom-dwelling flat-headed fish with large eyes and a duck-like snout | - |
| flavonoid | (noun) any of a large class of plant pigments having a chemical structure based on or similar to flavone | - |
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| flaxseed | (noun) the seed of flax used as a source of oil | Synonyms: linseed |
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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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| flood | (noun) the act of flooding; filling to overflowing | Synonyms: flowage |
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| (noun) a large flow | Synonyms: outpouring, overflow |
| (noun) light that is a source of artificial illumination having a broad beam; used in photography | Synonyms: flood lamp, floodlight, photoflood |
| (noun) the occurrence of incoming water (between a low tide and the following high tide) | Synonyms: flood tide, rising tide |
| (noun) the rising of a body of water and its overflowing onto normally dry land | Synonyms: alluvion, deluge, inundation |
| (noun) an overwhelming number or amount | Synonyms: deluge, inundation, torrent |
| floodhead | (noun) a wall of water rushing ahead of the flood | - |
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| floorboard | (noun) a board in the floor | Synonyms: floor board |
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| (noun) the floor of an automobile | - |
| flowerbed | (noun) a bed in which flowers are growing | Synonyms: bed of flowers, flower bed |
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| fluid | (noun) continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas | - |
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| (noun) a substance that is fluid at room temperature and pressure | - |
| fold | (noun) the act of folding | Synonyms: folding |
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| (noun) a pen for sheep | Synonyms: sheep pen, sheepcote, sheepfold |
| (noun) a folded part (as in skin or muscle) | Synonyms: plica |
| (noun) a group of people who adhere to a common faith and habitually attend a given church | Synonyms: congregation, faithful |
| (noun) a group of sheep or goats | Synonyms: flock |
| (noun) a geological process that causes a bend in a stratum of rock | Synonyms: folding |
| (noun) an angular or rounded shape made by folding | Synonyms: bend, crease, crimp, flexure, plication |
| food | (noun) any substance that can be metabolized by an animal to give energy and build tissue | Synonyms: nutrient |
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| (noun) anything that provides mental stimulus for thinking | Synonyms: food for thought, intellectual nourishment |
| (noun) any solid substance (as opposed to liquid) that is used as a source of nourishment | Synonyms: solid food |
| footboard | (noun) a vertical board or panel forming the foot of a bedstead | - |
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| (noun) a narrow platform on which to stand or brace the feet | - |
| foothold | (noun) an initial accomplishment that opens the way for further developments | Synonyms: beachhead |
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| (noun) a place providing support for the foot in standing or climbing | Synonyms: footing |
| (noun) an area in hostile territory that has been captured and is held awaiting further troops and supplies | Synonyms: bridgehead |
| footpad | (noun) a highwayman who robs on foot | Synonyms: padder |
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| ford | (noun) the act of crossing a stream or river by wading or in a car or on a horse | Synonyms: fording |
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| (noun) a shallow area in a stream that can be forded | Synonyms: crossing |
| foreground | (noun) (computer science) a window for an active application | - |
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| (noun) the part of a scene that is near the viewer | - |
| forehand | (noun) (sports) a return made with the palm of the hand facing the direction of the stroke (as in tennis or badminton or squash) | Synonyms: forehand shot, forehand stroke |
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| forehead | (noun) the part of the face above the eyes | Synonyms: brow |
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| (noun) the large cranial bone forming the front part of the cranium: includes the upper part of the orbits | Synonyms: frontal bone, os frontale |
| foreland | (noun) a natural elevation (especially a rocky one that juts out into the sea) | Synonyms: head, headland, promontory |
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| (noun) land forming the forward margin of something | - |
| foreword | (noun) a short introductory essay preceding the text of a book | Synonyms: preface, prolusion |
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| foreyard | (noun) a yard on the lower mast of a square-rigged foremast of a ship used to support the foresail. | Synonyms: fore-yard |
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| forward | (noun) a position on a basketball, soccer, or hockey team | - |
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| (noun) the person who plays the position of forward in certain games, such as basketball, soccer, or hockey | - |
| foulard | (noun) a light plain-weave or twill-weave silk or silklike fabric (usually with a printed design) | - |
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| found | (noun) food and lodging provided in addition to money | - |
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| fountainhead | (noun) an abundant source | Synonyms: well, wellspring |
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| (noun) the source of water from which a stream arises | Synonyms: head, headspring |
| foxhound | (noun) medium-sized glossy-coated hounds developed for hunting foxes | - |
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| fraud | (noun) intentional deception resulting in injury to another person | - |
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| (noun) something intended to deceive; deliberate trickery intended to gain an advantage | Synonyms: dupery, fraudulence, hoax, humbug, put-on |
| (noun) the act of swindling by some fraudulent scheme | Synonyms: cheat, rig, swindle |
| (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, imposter, impostor, pretender, pseud, pseudo, role player, sham, shammer |
| freehold | (noun) tenure by which land is held in fee simple or for life | - |
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| (noun) an estate held in fee simple or for life | - |
| friend | (noun) a person you know well and regard with affection and trust | - |
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| (noun) a person with whom you are acquainted | Synonyms: acquaintance |
| (noun) an associate who provides cooperation or assistance | Synonyms: ally |
| (noun) a person who backs a politician or a team etc. | Synonyms: admirer, booster, champion, protagonist, supporter |
| fringepod | (noun) annual herb having pinnatifid basal leaves and slender racemes of small white flowers followed by one-seeded winged silicles | Synonyms: lacepod |
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| frond | (noun) compound leaf of a fern or palm or cycad | - |
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| frostweed | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostwort, Helianthemum canadense |
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| (noun) tall perennial herb having clusters of white flowers; the eastern United States | Synonyms: frost-weed, Verbesina virginica, Virginia crownbeard |
| fruitwood | (noun) wood of various fruit trees (as apple or cherry or pear) used especially in cabinetwork | - |
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| fuckhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| fucoid | (noun) any of various algae of the family Fucaceae | Synonyms: fucoid algae |
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| (noun) a fossilized cast or impression of algae of the order Fucales | - |
| fund | (noun) a financial institution that sells shares to individuals and invests in securities issued by other companies | Synonyms: investment company, investment firm, investment trust |
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| (noun) a reserve of money set aside for some purpose | Synonyms: monetary fund |
| (noun) a supply of something available for future use | Synonyms: stock, store |
| gad | (noun) a sharp prod fixed to a rider's heel and used to urge a horse onward | Synonyms: spur |
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| gadoid | (noun) a soft-finned fish of the family Gadidae | Synonyms: gadoid fish |
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| gameboard | (noun) a flat portable surface (usually rectangular) designed for board games | Synonyms: board |
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| gangboard | (noun) a temporary bridge for getting on and off a vessel at dockside | Synonyms: gangplank, gangway |
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| gangland | (noun) underworld organizations | Synonyms: gangdom, organized crime |
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| ganoid | (noun) primitive fishes having thick bony scales with a shiny covering | Synonyms: ganoid fish |
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| gaolbird | (noun) a criminal who has been jailed repeatedly | Synonyms: jail bird, jailbird |
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| garboard | (noun) the first wale laid next to the keel of a wooden ship | Synonyms: garboard plank, garboard strake |
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