reversionist vs backslider

reversionist and backslider both are nouns.

Word	Noun	Adjective	Verb	Adverb
reversionist	Yes	No	No	No
backslider	Yes	No	No	No

As nouns, reversionist and backslider are synonyms defined as:

reversionist and backslider: someone who lapses into previous undesirable patterns of behavior

Other synonyms of reversionist include recidivist.

reversionist (noun)	backslider (noun)
someone who lapses into previous undesirable patterns of behavior	someone who lapses into previous undesirable patterns of behavior