assembly vs convention

assembly and convention both are nouns.

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

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

assembly (noun)	convention (noun)
the social act of assembling	the act of convening
the act of constructing something (as a piece of machinery)	orthodoxy as a consequence of being conventional
a group of machine parts that fit together to form a self-contained unit	something regarded as a normative example
a public facility to meet for open discussion	(diplomacy) an international agreement
a unit consisting of components that have been fitted together	a large formal assembly
a group of persons who are gathered together for a common purpose