confluence vs coming together

confluence and coming together both are nouns.

Word	Noun	Adjective	Verb	Adverb
confluence	Yes	No	No	No
coming together	Yes	No	No	No

As nouns, coming together is a hypernym of confluence; that is, coming together is a word with a broader meaning than confluence:

Other hypernyms of confluence include meeting, merging.

confluence (noun)	coming together (noun)
a flowing together	the social act of assembling for some common purpose
a coming together of people	the act of joining together as one
a place where things merge or flow together (especially rivers)