asceticism vs ism

asceticism and ism both are nouns.

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

As nouns, ism is a hypernym of asceticism; that is, ism is a word with a broader meaning than asceticism:

asceticism: the doctrine that through renunciation of worldly pleasures it is possible to achieve a high spiritual or intellectual state
ism: a belief (or system of beliefs) accepted as authoritative by some group or school

Other hypernyms of asceticism include doctrine, philosophical system, philosophy, school of thought.

asceticism (noun)	ism (noun)
rigorous self-denial and active self-restraint	a belief (or system of beliefs) accepted as authoritative by some group or school
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