miscarry vs fluff

miscarry is not a noun while fluff is a noun.

Word	Noun	Adjective	Verb	Adverb
miscarry	No	No	Yes	No
fluff	Yes	No	Yes	No

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

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

miscarry (verb)	fluff (verb)
suffer a miscarriage	ruffle (one's hair) by combing the ends towards the scalp, for a full effect
be unsuccessful	erect or fluff up
	make a mess of, destroy or ruin