self-mortification vs self-abasement

self-mortification and self-abasement both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-mortification	Yes	No	No	No
self-abasement	Yes	No	No	No

As nouns, self-mortification and self-abasement are synonyms defined as:

self-mortification and self-abasement: voluntary self-punishment in order to atone for some wrongdoing

Other synonyms of self-mortification include penance.

self-mortification (noun)	self-abasement (noun)
voluntary self-punishment in order to atone for some wrongdoing	voluntary self-punishment in order to atone for some wrongdoing