revert vs reversion

revert is not a noun while reversion is a noun.

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

revert (noun)	reversion (noun)
	a failure to maintain a higher state
	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)

revert (verb)	reversion (verb)
go back to a previous state
undergo reversion, as in a mutation