finishing vs culmination

finishing and culmination both are nouns.

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

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

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

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