stamp collection vs assemblage

stamp collection and assemblage both are nouns.

Word	Noun	Adjective	Verb	Adverb
stamp collection	Yes	No	No	No
assemblage	Yes	No	No	No

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

Other hypernyms of stamp collection include accumulation, aggregation, collection.

stamp collection (noun)	assemblage (noun)
the collection and study of postage stamps	the social act of assembling
a collection of stamps	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