comb vs comb-out

comb and comb-out both are nouns.

Word	Noun	Adjective	Verb	Adverb
comb	Yes	No	Yes	No
comb-out	Yes	No	No	No

As nouns, comb-out is a hyponym of comb; that is, comb-out is a word with a more specific, narrower meaning than comb:

Other hyponyms of comb include teasing.

comb (noun)	comb-out (noun)
the act of drawing a comb through hair	the act of removing tangles from you hair with a comb
ciliated comb-like swimming plate of a ctenophore	the act of carefully weeding out unwanted things or people
the fleshy red crest on the head of the domestic fowl and other gallinaceous birds
a flat device with narrow pointed teeth on one edge; disentangles or arranges hair
any of several tools for straightening fibers

comb (verb)	comb-out (verb)
smoothen and neaten with or as with a comb
search thoroughly
straighten with a comb