comb out vs fluff

comb out is not a noun while fluff is a noun.

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

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

comb out: smoothen and neaten with or as with a comb
fluff: ruffle (one's hair) by combing the ends towards the scalp, for a full effect

Other hyponyms of comb out include sleek down, slick, slick down, tease.

comb out (noun)	fluff (noun)
	a blunder (especially an actor's forgetting the lines)
	something of little value or significance
	any light downy material

comb out (verb)	fluff (verb)
smoothen and neaten with or as with a comb	ruffle (one's hair) by combing the ends towards the scalp, for a full effect
remove unwanted elements	erect or fluff up
	make a mess of, destroy or ruin