ruffle vs fold up

ruffle is a noun but fold up is not a noun.

Word	Noun	Adjective	Verb	Adverb
ruffle	Yes	No	Yes	No
fold up	No	No	Yes	No

As verbs, fold up is a hypernym of ruffle; that is, fold up is a word with a broader meaning than ruffle:

Other hypernyms of ruffle include fold, turn up.

ruffle (noun)	fold up (noun)
a noisy fight
a high tight collar
a strip of pleated material used as a decoration or a trim

ruffle (verb)	fold up (verb)
pleat or gather into a ruffle	become folded or folded up
erect or fluff up	bend or lay so that one part covers the other
disturb the smoothness of
twitch or flutter
mix so as to make a random order or arrangement
trouble or vex
discompose
stir up (water) so as to form ripples
to walk with a lofty proud gait, often in an attempt to impress others