Letter: f
- fief, equitable estate, estate at sufferance, estate for life, estate for years, estate in expectancy, estate in fee, estate in possession, estate tail, fee, fee simple, fee tail, feud, feudal estate, lease, leasehold

- fiefdom, adverse possession, claim, colony, de facto, dependency, derivative title, fee fief, fee position, fee simple, fee simple absolute, fee simple conditional, fee simple determinable, fee tail, feud, freehold

- field army, army, battalion, battery, brigade, cadre, cohort, column, company, corps, detachment, detail, division, file, garrison, kitchen police

- field artillery, battery, cannon, flak, ordnance

- field day, banquet, blow-out, carnival, carousel, do, fair, feast, festival, festive occasion, festivity, fiesta, gala, gala affair, gala day, games

- field hospital, asylum, clinic, convalescent home, home, hospital, infirmary, mental hospital, nursing home, rest home, sanatorium, sick bay, sickroom, ward

- field marshal, OD, aide, brass, brigadier, captain, colonel, commandant, commander, executive officer, general, lieutenant, major, marshal, officer, subaltern

- field mouse, animal, antelope, armadillo, bat, elephant, hare, horse, kangaroo, mammal, opossum, pig, platypus, rat

- field of battle, battlefield, field, firing line, front, front line, line, shambles, theatre

- field of blood, battlefield, concentration camp, field, firing line, front, front line, gas chamber, line, shambles, theatre

- field of inquiry, area, arena, art, concern, discipline, domain, field, natural science, province, science, social science, speciality, sphere, study, technology

- field of study, area, arena, art, concern, discipline, domain, field, natural science, province, science, social science, speciality, sphere, study, technology

- field of view, command, discernment, domination, eye, eyesight, horizon, ken, naked eye, outlook, perception, perspective, perspicacity, perspicuity, prospect, purview

- field of vision, command, discernment, domination, eye, eyesight, horizon, ken, naked eye, outlook, perception, perspective, perspicacity, perspicuity, prospect, purview

- field officer, OD, aide, brass, brigadier, captain, colonel, commandant, commander, executive officer, general, lieutenant, major, marshal, officer, subaltern

- field rations, allotment, allowance, board, commons, meal, mess, rations, tucker

- field spirit, deity, faun, fertility god, forest god, god, goddess, satyr, sylvan deity

- field train, army, battalion, battery, brigade, cadre, cohort, column, company, corps, detachment, detail, division, file, garrison, kitchen police

- field, academic discipline, academic speciality, achievement, acreage, aerodrome, air base, airfield, airport, ambit, amphitheatre, ample scope, animal charge, answer, applied science, arable

- fieldwork, bank, barricade, barrier, bastion, battlement, breastwork, bulwark, curtain, dike, drawbridge, earthwork, enclosure, entanglement, escarpment, fence

- fiend from hell, demon, devil, dybbuk, evil spirit, fiend, genie, genius, ghoul, incubus, monster, succubus, vampire, werewolf

- fiend, Beelzebub, Lucifer, Mafioso, Satan, addict, aficionado, alcoholic, ape-man, beast, berserk, berserker, bigot, bomber, brute, buff

- fiendish, Draconian, animal, atrocious, bad, baleful, barbaric, barbarous, beastly, bestial, bloodthirsty, bloody, bloody-minded, brutal, brutalized, brute

- fiendishly, atrociously, cruelly, ferociously

- fiendishness, animality, barbarity, baseness, bestiality, brutality, cruelty, devilry, evilness, ferocity, inhumanity, monstrosity, ruthlessness, sadism, savagery, truculence

- fierce, Draconian, abandoned, acid, acidulous, acrid, acrimonious, acute, aggressive, amok, angry, animal, antagonistic, astringent, atrocious, awful

- fiercely, atrociously, cruelly, desperately, ferociously, frantically, furiously, hardly, hotly, intensely, like mad, madly, rigorously, tooth and nail, vengeance, violently

- fierceness, acerbity, acidity, acridity, acrimony, aggression, animality, antagonism, astringency, atrocity, barbarity, belligerence, bestiality, bite, bitterness, brutality

- fieriness, ardour, bloom, blush, enthusiasm, fervour, fire, flush, glow, heat, hectic, incandescence, passion, redness, vehemence, warmth

- fiery cross, Klaxon, Mayday, SOS, alert, all clear, banner, beacon, buzzer, colours, face, fire bell, foghorn, horn, hue and cry, independence
