concourse vs multitude

concourse and multitude both are nouns.

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

As nouns, concourse and multitude are synonyms defined as:

Other synonyms of concourse include throng.

concourse (noun)	multitude (noun)
a coming together of people	a large gathering of people
a wide hallway in a building where people can walk	the common people generally
a large gathering of people	a large indefinite quantity