cumulation vs cumulus

cumulation and cumulus both are nouns.

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

As nouns, cumulation and cumulus are synonyms defined as:

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

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

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

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