culmination vs windup

culmination and windup both are nouns.

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

As nouns, culmination and windup are synonyms defined as:

Other synonyms of culmination include closing, completion, mop up.

culmination (noun)	windup (noun)
a concluding action	a concluding action
the decisive moment in a novel or play
(astronomy) a heavenly body's highest celestial point above an observer's horizon
a final climactic stage

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