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Abstainer

//æbˈsteɪ.nɚ// noun

Noun

1
One who abstains; especially, one who abstains from something, such as the use of alcohol or drugs, or one who abstains for religious reasons; one who practices self-denial.
"To one of my very nervous patients, who was an abstainer, whose fancy was fixed on his mother, and who repeatedly dreamed of climbing stairs accompanied by his mother, I once remarked that moderate masturbation would be less harmful to him than enforced abstinence."
2
a person who refrains from drinking intoxicating beverages wordnet
3
someone who practices self denial as a spiritual discipline wordnet

From Middle English absteyner, equivalent to abstain + -er.

Unscramble this word: abstainer