hollow vs cavern

hollow and cavern both are nouns.

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

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

hollow (noun)	cavern (noun)
a depression hollowed out of solid matter	a large cave or a large chamber in a cave
a small valley between mountains	any large dark enclosed space
a cavity or space in something

hollow (adjective)	cavern (adjective)
not solid; having a space or gap or cavity
lacking in substance or character
devoid of significance or force
as if echoing in a hollow space

hollow (verb)	cavern (verb)
remove the interior of	hollow out as if making a cavern
remove the inner part or the core of