moment vs culmination

moment and culmination both are nouns.

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

As nouns, culmination is a hyponym of moment; that is, culmination is a word with a more specific, narrower meaning than moment:

moment (noun)	culmination (noun)
having important effects or influence	a concluding action
the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed value	the decisive moment in a novel or play
a turning force produced by an object acting at a distance (or a measure of that force)	(astronomy) a heavenly body's highest celestial point above an observer's horizon
a particular point in time	a final climactic stage
an indefinitely short time
at this time