enclosure vs cavern

enclosure and cavern both are nouns.

Word	Noun	Adjective	Verb	Adverb
enclosure	Yes	No	No	No
cavern	Yes	No	Yes	No

As nouns, cavern is a hyponym of enclosure; that is, cavern is a word with a more specific, narrower meaning than enclosure:

Other hyponyms of enclosure include matrix.

enclosure (noun)	cavern (noun)
the act of enclosing something inside something else	a large cave or a large chamber in a cave
a structure consisting of an area that has been enclosed for some purpose	any large dark enclosed space
something (usually a supporting document) that is enclosed in an envelope with a covering letter
a naturally enclosed space

enclosure (verb)	cavern (verb)
	hollow out as if making a cavern