meeting vs session

meeting and session both are nouns.

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

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

Other hyponyms of meeting include rendezvous, socialisation, socialising, socialization, socializing, visit, visit, visit.

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

meeting (noun)	session (noun)
the social act of assembling for some common purpose	a meeting devoted to a particular activity
the act of joining together as one	a meeting for execution of a group's functions
a casual or unexpected convergence	a meeting of spiritualists
a formally arranged gathering	the time during which a school holds classes
a small informal social gathering
a place where things merge or flow together (especially rivers)