- four-ball match
- four-banger
- four bits
- four-by-four
- four-by-two
- four-channel
- fourché
- fourchette
- four-color
- four-color problem
- four-colour
- four-corners
- four-cycle
- four-deal bridge
- four-dimensional
- Fourdrinier
- four-eyed
- four-eyed fish
- four-eyed opossum
- four-eyes
- four flush
- fourflusher
- fourfold
- fourfold block
- fourfold purchase
- four-footed
- four-four time
- four freedoms
- fourgonfourgon synonyms
- four-handed
- Four-H Club
- Four Horsemen
- Four Horsemen of the Apocalypse
- Four Hundred
- four-hundred-day clock
- Fourier
- Fourier analysis
- Fourierism
- Fourier series
- Fourier's theorem
- Fourier transform
- four-in-hand
- four-lanefour-lane synonyms
- four-leaf clover
- four-legged
- four-letter wordfour-letter word synonyms
- four-letter words
- four-masted
- Four Modernizations
- Fournier
- Four Noble Truths
- four-o'clock
- four-o'clock family
- four of a kind
- four old cat
- four-on-the-floor
- four-part
- four-part harmony
- fourpence
- fourpenny
- fourplay
- fourplex
- fourposter
- four questions
- fourragère
- four-rowed barley
- fourscore
- foursomefoursome synonyms
- four-spot
- foursquarefoursquare synonyms
- four-starfour-star synonyms
- four-striperfour-striper synonyms
- four-stroke
- fourteen
- fourteener
- Fourteen Points
- fourteenth
- Fourteenth Amendment
- fourthfourth synonyms
- Fourth Amendment
- fourth class
- Fourth Commandment
- fourth dimensionfourth dimension synonyms
- fourth estate
- Fourth International
- fourthly
- Fourth of JulyFourth of July synonyms
- fourth position
- fourth quantum number
- Fourth Republic
- fourth wall
- Fourth World
- four-way
- four-wheel
- four-wheel drivefour-wheel drive synonyms
- four-wheelerfour-wheeler synonyms
- four-wheeling
- Fouta Djallon
- fouter
- fovea
- fovea centralis
- foveate
- foveola
- foveolate
- foveole
- Fowey
- fowlfowl synonyms
- fowl cholera
- fowler
- Fowler flap
- Fowler's toad
- Fowles
- Fowliang
- fowlingfowling synonyms
- fowling piece
- fowl mite
- fowl paralysis
- fowl pest
- fowl pox
- fowl typhoid
- foxfox synonyms
- foxberry
- fox bolt
- Foxborough
- fox brush
- Foxe
- Foxe Basin
- foxedfoxed synonyms
- foxfire
- foxglove
- fox grape
- foxholefoxhole synonyms
- foxhoundfoxhound synonyms
- fox hunt
- fox hunting
- foxie
- foxingfoxing synonyms
- Fox Islands
- fox moth
- fox snake
- fox sparrow
- fox squirrel
- foxtail
- foxtail millet
- foxtail wedge
- Fox Talbot
- fox terrier
- fox trot
- Foxx
- foxyfoxy synonyms
- foy
- foyboat
- foyerfoyer synonyms
- Foyt
- fozy
- fp
- FPA
- FPC
- FPHA
- Fpl
- fpm
- FPO
- fps
- fpsps
- fps units
- FPT
- Fr
- Fra
- frabjous
- fracasfracas synonyms
- Fracastorius
- fracking
- FRACP
- FRACS
- fractable
- fractal
- fracted
- fractionfraction synonyms
- fractionalfractional synonyms
- fractional crystallization
- fractional currency
- fractional distillation
- fractionalize
- fractional orbital bombardment system
- fractionate
- fractionating column
- fractionation
- fractionator
- fractionize
- fractiousfractious synonyms
- fractocumulus
- fractostratus
- fracturefracture synonyms
- fracture zone
- fractus
- frae
- fraenulum
- fraenum
- Fra Filippo Lippi
- frag
- fragilefragile synonyms
- fragile X syndrome
- fragmentfragment synonyms
- fragmental
- fragmentaryfragmentary synonyms
- fragmentate
- fragmentationfragmentation synonyms
- fragmentation bomb
- fragmentation grenade
- fragmentedfragmented synonyms
- fragmentizefragmentize synonyms
- fragmentized
- Fragonard
- fragrancefragrance synonyms
- fragrance strip
- fragrancy
- fragrantfragrant synonyms
- fragrant orchid
- fragrant sumac
- fraidy-catfraidy-cat synonyms
- frailfrail synonyms
- frailero
- frailtyfrailty synonyms
- Frailty, thy name is woman!
- fraisefraise synonyms
- fraise du bois
- Fraktur
- Fra Mauro
- frambesia
- framboesia
- framboise
- frameframe synonyms
- frame aerial
- frame house
- frame line
- frame of mindframe of mind synonyms
- frame of referenceframe of reference synonyms
- framepack
- frame saw
- frameshift
- frameshift mutation
- frame story
- frame-upframe-up synonyms
- frameworkframework synonyms
- framingframing synonyms
- framing chisel
- Framingham
- framing square
- Fram Strait
- Fran
- franc
- Franca
- Françaix
- France
- France Ancient
- France, fall of
- France Modern
- Frances
- Francesca
- Francesca da Rimini
- Francescatti
- Franche-Comté
- franchisefranchise synonyms
- franchise clause
- franchisee
- franchiserfranchiser synonyms
- Franchot
- Francia
- Francie
- Francine
- Francis
- Franciscan
- Franciscans
- Francisco
- Francis Ferdinand
- Francis Ferdinand, Archduke
- Francis I
- Francis II
- Francis Joseph I
- Francis of Assisi
- Francis of Paula
- Francis of Sales
- Francis turbine
- Francis Xavier
- francium
- francize
- Franck
- Franco
- Franco-American
- Franco-Belgian system
- Franco, Francisco
- francolin
- Franconia
- Franconian
- Francophile
- Francophobe
- Francophone
- Franco-Provençal
- Franco-Prussian War
- franc-tireur