Nut

couille

(slang: testicle)

folle

(slang: insane person)

folle

(extreme enthusiast)

fou

(slang: insane person)

fou

(extreme enthusiast)

fruit sec

(hard-shelled fruit)

fruit à coque

(hard-shelled fruit)

malade

(extreme enthusiast)

noix

(hard-shelled fruit)

sillet

(musical instruments: small piece that holds the strings at the proper spacing)

écrou

(that fits on a bolt)