reversion vs recurrence

reversion and recurrence both are nouns.

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

As nouns, recurrence is a hypernym of reversion; that is, recurrence is a word with a broader meaning than reversion:

Other hypernyms of reversion include return.

reversion (noun)	recurrence (noun)
a failure to maintain a higher state	happening again (especially at regular intervals)
turning in the opposite direction
returning to a former state
(genetics) a return to a normal phenotype (usually resulting from a second mutation)
a reappearance of an earlier characteristic
(law) an interest in an estate that reverts to the grantor (or his heirs) at the end of some period (e.g., the death of the grantee)