cumulation vs assemblage

cumulation and assemblage both are nouns.

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

As nouns, assemblage is a hypernym of cumulation; that is, assemblage is a word with a broader meaning than cumulation:

Other hypernyms of cumulation include accumulation, aggregation, collection.

cumulation (noun)	assemblage (noun)
a collection of objects laid on top of each other	the social act of assembling
	a system of components assembled together for a particular purpose
	a group of persons together in one place
	several things grouped together or considered as a whole