category vs assemblage

category and assemblage both are nouns.

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

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

Other hypernyms of category include accumulation, aggregation, collection.

category (noun)	assemblage (noun)
a general concept that marks divisions or coordinations in a conceptual scheme	the social act of assembling
a collection of things sharing a common attribute	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