- First in war, first in peace, and first in the hearts of his countrymen
- first lady
- first language
- first lieutenant
- first light
- first-line
- firstling
- First Lord
- first-loss policy
- firstly
- first mate
- first messenger
- First Minister
- first mortgage
- First Mover
- first name
- first-name
- First Nation
- First Nations
- first night
- firstnighter
- first-nighter
- first of all
- first off
- first offender
- first officer
- first-order
- first papers
- first-past-the-post
- First Peoples
- first person
- first-person shooter
- First Point of Aries
- first position
- first post
- first principle
- first quantum number
- first quarter
- first quartile
- first-rate
- First Reader
- first reading
- first refusal
- First Reich
- First Republic
- first responder
- first run
- firsts
- first-sale doctrine
- first school
- First Secretary
- first sergeant
- First State
- first strike
- first-strike
- first string
- first-string
- first-termer
- first thing
- first things first
- first-time
- first-timer
- first water
- First World
- first world problem
- First World War
- firth
- Firth
- fisc
- fiscal
- fiscal agent
- fiscal cliff
- fiscal drag
- fiscally
- fiscal policy
- fiscal year
- Fischer
- Fischer-Dieskau
- Fischer-Tropsch process
- Fischer von Erlach
- fish
- Fish
- FISH
- fishable
- fish and brewis
- fish and chips
- fish-and-chip shop
- fish-bellied
- fishbolt
- fishbone fern
- fishbowl
- fishcake
- fish cake
- fish crow
- fish culture
- fish doctor
- fish duck
- fish eagle
- fish-eating
- fisher
- Fisher
- Fisher King
- fisherman
- fisherman's bend
- fisherman's knot
- fisherman's ring
- fisherwoman
- fishery
- fishes
- Fishes
- fisheye
- fisheye lens
- fish farm
- fishfinger
- fish flake
- fish flour
- fishfly
- fish food
- fish for
- fish fork
- fish fry
- fish geranium
- fishgig
- Fishguard
- fish hatchery
- fish hawk
- fishhook
- fish-hook
- fishhook cactus
- fishing
- fishing banks
- fishing expedition
- fishing fleet
- fishing ground
- fishing hole
- fishing pole
- fishing rod
- fishing smack
- fishing tackle
- fishing trip
- fishing worm
- fish in troubled waters
- fish joint
- fishkill
- fish knife
- fish ladder
- fishline
- fish louse
- fishmeal
- fish meal
- fishmonger
- fishnet
- fish or cut bait
- Fish or cut bait
- fish out
- Fish out of water
- fish out of water, a
- fishplate
- fish pole
- fishpond
- fishpound
- fish protein concentrate
- fish sauce
- fishskin
- fishskin disease
- fish slice
- fish stick
- fish story
- fish tackle
- fishtail
- fish tail
- fish tank
- fish warden
- fishway
- fishwife
- fishworm
- fishy
- fisk
- Fisk
- Fiske
- fissi-
- fissile
- fission
- fission, nuclear
- fissionable
- fission bomb
- fission-fusion bomb
- fission product
- fission reactor
- fission track
- fission-track dating
- fissipalmate
- fissiparous
- fissiped
- fissirostral
- fissure
- fissure eruption
- fissure of Rolando
- fissure of Sylvius
- fist
- fist bump
- fistfight
- fistful
- fistiana
- fistic
- fisticuff
- fisticuffs
- fistmele
- fistnote
- fist pump
- fistula
- fistulize
- fistulous
- fit
- FIT
- fit as a fiddle
- fitch
- Fitch
- Fitchburg
- fitchew
- fitful
- fit in
- fit like a glove
- fitly
- fitment
- fitna
- fitness
- fitness tracker
- fit note
- fit out
- fits and starts
- fitspiration
- fitspo
- fitted
- fitten
- fitter
- fitting
- fitting room
- Fittipaldi
- fit to be tied
- fit to kill
- fittonia
- fit up
- Fitzgerald
- FitzGerald
- Fitzgerald, Ella
- Fitzgerald, F. Scott
- FitzGerald contraction
- Fitzgerald-Lorentz contraction
- Fitzhugh
- Fitzpatrick
- Fitzrovia
- Fitzroy
- Fitzsimmons
- Fitzwilliam Museum
- Fiume
- five
- five-alarm
- five-and-dime
- five-and-ten
- five-a-side
- five by five
- five-by-five
- Five Civilized Nations
- five-eighth
- Five-Elements School
- five-faced bishop
- five-finger
- fivefold
- five-gaited
- five hole
- five hundred
- five hundred rummy
- five Ks
- five-legged
- Five Nations
- Five Nations Championship
- five o'clock shadow
- five-o'clock shadow
- fivepenny
- fivepins
- fiver
- fives
- five senses
- five-speed
- five-spice powder
- five-spot
- five-star
- five stones
- Five Towns
- five W's
- Five-Year Plan
- fix
- fixate
- fixated
- fixation
- fixative
- fixator
- fixed
- fixed action pattern
