meeting vs town meeting

meeting and town meeting both are nouns.

Word	Noun	Adjective	Verb	Adverb
meeting	Yes	No	No	No
town meeting	Yes	No	No	No

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

meeting (noun)	town meeting (noun)
the social act of assembling for some common purpose	government of a town by an assembly of the qualified voters
the act of joining together as one	a meeting of the inhabitants of a town
a casual or unexpected convergence
a formally arranged gathering
a small informal social gathering
a place where things merge or flow together (especially rivers)