loner vs troglodyte

loner and troglodyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
loner	Yes	No	No	No
troglodyte	Yes	No	No	No

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

Other hyponyms of loner include hermit, recluse, solitary, solitudinarian.

loner (noun)	troglodyte (noun)
a person who avoids the company or assistance of others	someone who lives in a cave
	one who lives in solitude