coincidence vs concurrence

coincidence and concurrence both are nouns.

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

As nouns, coincidence and concurrence are synonyms defined as:

coincidence and concurrence: the temporal property of two things happening at the same time

Other synonyms of coincidence include co-occurrence, conjunction.

coincidence (noun)	concurrence (noun)
the temporal property of two things happening at the same time	acting together, as agents or circumstances or events
the quality of occupying the same position or area in space	the temporal property of two things happening at the same time
an event that might have been arranged although it was really accidental	agreement of results or opinions
	a state of cooperation