reversion vs relapsing

reversion and relapsing both are nouns.

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

As nouns, reversion and relapsing are synonyms defined as:

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

reversion (noun)	relapsing (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)