roof vs cave

roof and cave both are nouns.

Word	Noun	Adjective	Verb	Adverb
roof	Yes	No	Yes	No
cave	Yes	No	Yes	No

roof (noun)	cave (noun)
a protective covering that covers or forms the top of a building	a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea
protective covering on top of a motor vehicle
an upper limit on what is allowed
the inner top surface of a covered area or hollow space

roof (verb)	cave (verb)
provide a building with a roof; cover a building with a roof	explore natural caves
	hollow out as if making a cave or opening