fluff vs screw up

fluff is a noun but screw up is not a noun.

Word	Noun	Adjective	Verb	Adverb
fluff	Yes	No	Yes	No
screw up	No	No	Yes	No

As verbs, fluff and screw up are synonyms defined as:

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

fluff (verb)	screw up (verb)
ruffle (one's hair) by combing the ends towards the scalp, for a full effect	twist into a strained configuration
erect or fluff up	make more intense
make a mess of, destroy or ruin	screw or turn higher
	make a mess of, destroy or ruin