boner vs fluff

boner and fluff both are nouns.

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

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

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

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