austerity vs nonindulgence

austerity and nonindulgence both are nouns.

Word	Noun	Adjective	Verb	Adverb
austerity	Yes	No	No	No
nonindulgence	Yes	No	No	No

As nouns, austerity and nonindulgence are synonyms defined as:

austerity and nonindulgence: the trait of great self-denial (especially refraining from worldly pleasures)

Other synonyms of austerity include asceticism.

austerity (noun)	nonindulgence (noun)
the trait of great self-denial (especially refraining from worldly pleasures)	the trait of great self-denial (especially refraining from worldly pleasures)