co-occurrence vs concurrence

co-occurrence and concurrence both are nouns.

Word	Noun	Adjective	Verb	Adverb
co-occurrence	Yes	No	No	No
concurrence	Yes	No	No	No

As nouns, co-occurrence and concurrence are synonyms defined as:

co-occurrence and concurrence: the temporal property of two things happening at the same time

Other synonyms of co-occurrence include coincidence, conjunction.

co-occurrence (noun)	concurrence (noun)
the temporal property of two things happening at the same time	acting together, as agents or circumstances or events
an event or situation that happens at the same time as or in connection with another	the temporal property of two things happening at the same time
	agreement of results or opinions
	a state of cooperation