finishing vs windup

finishing and windup both are nouns.

Word	Noun	Adjective	Verb	Adverb
finishing	Yes	No	No	No
windup	Yes	Yes	No	No

As nouns, windup is a hypernym of finishing; that is, windup is a word with a broader meaning than finishing:

Other hypernyms of finishing include closing, completion, culmination, mop up.

finishing (noun)	windup (noun)
the act of finishing	a concluding action
a decorative texture or appearance of a surface (or the substance that gives it that appearance)

finishing (adjective)	windup (adjective)
	operated by a mechanism