asceticism vs ascesis

asceticism and ascesis both are nouns.

Word	Noun	Adjective	Verb	Adverb
asceticism	Yes	No	No	No
ascesis	Yes	No	No	No

As nouns, asceticism and ascesis are synonyms defined as:

asceticism (noun)	ascesis (noun)
rigorous self-denial and active self-restraint	rigorous self-denial and active self-restraint
the trait of great self-denial (especially refraining from worldly pleasures)
the doctrine that through renunciation of worldly pleasures it is possible to achieve a high spiritual or intellectual state