lapsing vs reversion

lapsing and reversion both are nouns.

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

As nouns, lapsing and reversion are synonyms defined as:

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

lapsing (noun)	reversion (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)