assembly vs congress

assembly and congress both are nouns.

Word	Noun	Adjective	Verb	Adverb
assembly	Yes	No	No	No
congress	Yes	No	No	No

As nouns, congress is a hyponym of assembly; that is, congress is a word with a more specific, narrower meaning than assembly:

assembly (noun)	congress (noun)
the social act of assembling	the social act of assembling for some common purpose
the act of constructing something (as a piece of machinery)	a meeting of elected or appointed representatives
a group of machine parts that fit together to form a self-contained unit	a national legislative assembly
a public facility to meet for open discussion
a unit consisting of components that have been fitted together
a group of persons who are gathered together for a common purpose