troglodyte vs cave dweller

troglodyte and cave dweller both are nouns.

Word	Noun	Adjective	Verb	Adverb
troglodyte	Yes	No	No	No
cave dweller	Yes	No	No	No

As nouns, troglodyte and cave dweller are synonyms defined as:

Other synonyms of troglodyte include cave man, caveman.

troglodyte (noun)	cave dweller (noun)
someone who lives in a cave	someone who lives in a cave
one who lives in solitude