Hole

creux

(hollow in some surface)

faille

(security vulnerability)

mitard

(place where a prisoner is kept)

trou

(hollow in some surface)

trou

(a through opening)

trou

(lack of an electron)

trou

(orifice (see anus etc. for specific body cavities))

trou

(place where a prisoner is kept)

trouer

(make holes)