cumulus vs aggregation

cumulus and aggregation both are nouns.

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

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

Other hypernyms of cumulus include accumulation, assemblage, collection.

cumulus (noun)	aggregation (noun)
a collection of objects laid on top of each other	the act of gathering something together
a globular cloud	several things grouped together or considered as a whole

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