unison vs concurrence

unison and concurrence both are nouns.

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

As nouns, concurrence is a hypernym of unison; that is, concurrence is a word with a broader meaning than unison:

Other hypernyms of unison include co-occurrence, coincidence, conjunction.

unison (noun)	concurrence (noun)
(music) two or more sounds or tones at the same pitch or in octaves	acting together, as agents or circumstances or events
occurring together or simultaneously	the temporal property of two things happening at the same time
corresponding exactly	agreement of results or opinions
	a state of cooperation