culminate vs culmination

culminate is not a noun while culmination is a noun.

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

culminate (noun)	culmination (noun)
	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

culminate (verb)	culmination (verb)
end, especially to reach a final or climactic stage
rise to, or form, a summit
bring to a head or to the highest point
reach the highest altitude or the meridian, of a celestial body
reach the highest or most decisive point