concourse vs legion

concourse and legion both are nouns.

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

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

Other hyponyms of concourse include hive, horde, host, herd, ruck.

concourse (noun)	legion (noun)
a coming together of people	a vast multitude
a wide hallway in a building where people can walk	a large military unit
a large gathering of people	association of ex-servicemen
	archaic terms for army

concourse (adjective)	legion (adjective)
	amounting to a large indefinite number