reversion vs relapse

reversion and relapse both are nouns.

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

As nouns, reversion and relapse are synonyms defined as:

Other synonyms of reversion include backsliding, lapse, lapsing, relapsing, reverting.

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

reversion (verb)	relapse (verb)
	go back to bad behavior
	deteriorate in health