concur vs concurrence

concur is not a noun while concurrence is a noun.

Word	Noun	Adjective	Verb	Adverb
concur	No	No	Yes	No
concurrence	Yes	No	No	No

concur (noun)	concurrence (noun)
	acting together, as agents or circumstances or events
	the temporal property of two things happening at the same time
	agreement of results or opinions
	a state of cooperation

concur (verb)	concurrence (verb)
happen simultaneously
be in accord; be in agreement