sexual abstention vs abstinence

sexual abstention and abstinence both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual abstention	Yes	No	No	No
abstinence	Yes	No	No	No

As nouns, abstinence is a hypernym of sexual abstention; that is, abstinence is a word with a broader meaning than sexual abstention:

sexual abstention: abstaining from sexual relations (as because of religious vows)
abstinence: act or practice of refraining from indulging an appetite

sexual abstention (noun)	abstinence (noun)
abstaining from sexual relations (as because of religious vows)	act or practice of refraining from indulging an appetite
	the trait of abstaining (especially from alcohol)