meeting vs group meeting

meeting and group meeting both are nouns.

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

As nouns, meeting and group meeting are synonyms defined as:

meeting (noun)	group meeting (noun)
the social act of assembling for some common purpose	a formally arranged gathering
the act of joining together as one
a casual or unexpected convergence
a formally arranged gathering
a small informal social gathering
a place where things merge or flow together (especially rivers)