cumulus vs cumulation

cumulus and cumulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
cumulus	Yes	Yes	No	No
cumulation	Yes	No	No	No

As nouns, cumulus and cumulation are synonyms defined as:

cumulus and cumulation: a collection of objects laid on top of each other

Other synonyms of cumulus include agglomerate, heap, mound, pile.

cumulus (noun)	cumulation (noun)
a collection of objects laid on top of each other	a collection of objects laid on top of each other
a globular cloud

cumulus (adjective)	cumulation (adjective)
of or related to cumulous clouds