Central America vs assemblage

Central America and assemblage both are nouns.

Word	Noun	Adjective	Verb	Adverb
Central America	Yes	No	No	No
assemblage	Yes	No	No	No

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

Other hypernyms of Central America include accumulation, aggregation, collection.

Central America (noun)	assemblage (noun)
the nations of Central America collectively	the social act of assembling
the isthmus joining North America and South America; extends from the southern border of Mexico to the northern border of Colombia	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