concourse vs confluence

concourse and confluence both are nouns.

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

As nouns, concourse and confluence are synonyms defined as:

concourse (noun)	confluence (noun)
a coming together of people	a flowing together
a wide hallway in a building where people can walk	a coming together of people
a large gathering of people	a place where things merge or flow together (especially rivers)