cumulus vs collection

cumulus and collection both are nouns.

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

As nouns, collection is a hypernym of cumulus; that is, collection is a word with a broader meaning than cumulus:

Other hypernyms of cumulus include accumulation, aggregation, assemblage.

cumulus (noun)	collection (noun)
a collection of objects laid on top of each other	the act of gathering something together
a globular cloud	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole

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