1) Abstainer 2) Abstaining individual 3) Clean fellow 4) Clean type 5) One abstaining 6) One who enjoys clean living 7) Teetotaler 
• Neglect or omission to use an easement or franchise or to assert a right. • A not using; failure to use. • Neglect or omission to use an easement or franchise or to assert a right. • A not using; failure to use.
Non·us'er 1. A not using; failure to use. « An office may be forfeited by misuser or nonuser .» Blackstone. 2. (Law) Neglect or omission to use an easement or franchise or to assert a right. Kent. 
a person who does not use or partake of something, as drugs or alcoholic beverages.