meeting vs concourse

meeting and concourse both are nouns.

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

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

Other hyponyms of meeting include confluence.

meeting (noun)	concourse (noun)
the social act of assembling for some common purpose	a coming together of people
the act of joining together as one	a wide hallway in a building where people can walk
a casual or unexpected convergence	a large gathering of people
a formally arranged gathering
a small informal social gathering
a place where things merge or flow together (especially rivers)