fort

strength

Spelled fort · fortis 'strong'

Latin fortis meant strong: fortresses stand strong, fortification strengthens walls, and fortitude is strength carried inside.

Words built from it

comfort — relief or strength given in distress
com- (thoroughly) + fort (strong)
effort — a vigorous exertion of strength
ef- (out) + fort (strong)
fortress — a strongly built, fortified place
fort (strong) + -ress (place)
fortify — to strengthen against attack or hardship
fort (strong) + -ify (to make)
fortitude — courage and strength in facing hardship
fort (strong) + -itude (state of)
fortification — a structure built to strengthen defense
fort (strong) + -ification (act of making)

fortunate — from Latin fortuna 'chance or luck,' not fortis 'strong'
fortune — from Latin fortuna 'chance, luck', the goddess of fate; unrelated to fortis 'strong'