convening vs assemblage

convening and assemblage both are nouns.

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

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

Other hypernyms of convening include assembly, gathering.

convening (noun)	assemblage (noun)
the act of convening	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