repeat vs recurrence

repeat and recurrence both are nouns.

Word	Noun	Adjective	Verb	Adverb
repeat	Yes	No	Yes	No
recurrence	Yes	No	No	No

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

Other hyponyms of repeat include sequence, cycle, rematch, replay, return.

repeat (noun)	recurrence (noun)
an event that repeats	happening again (especially at regular intervals)

repeat (verb)	recurrence (verb)
happen or occur again
to say, state, or perform again
to say again or imitate
make or do or perform again
repeat an earlier theme of a composition
do over