An abstainer is someone who refrains from certain activities or substances. Nonuser, ASCETIC, teetotaler, TEETOTALLER, vegan, and forgoer are all synonyms for abstainer. A nonuser is someone who does not use a particular thing. An ASCETIC is someone who practices self-denial and avoids physical comforts. A teetotaler is someone who abstains from alcohol, while a TEETOTALLER is someone who abstains from all forms of alcohol. A vegan is someone who does not eat any animal products. Finally, a forgoer is someone who voluntarily gives up something.