hole [holes](opening in a solid) noun [UK: həʊl] [US: hoʊl]
opening [openings](a gap permitting passage through) noun [UK: ˈəʊ.pən.ɪŋ] [US: ˈoʊ.pən.ɪŋ]The opening in this sweater is small and my head won't go through. = La abertura de este jersey es pequeña y no me cabe la cabeza.
slit [slits](narrow cut or opening; a slot) noun [UK: slɪt] [US: sˈlɪt]