The difference between Abstainer and Teetotaler
When used as nouns, abstainer means agent noun of abstain, whereas teetotaler means a person who completely abstains from alcoholic beverages.
check bellow for the other definitions of Abstainer and Teetotaler
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Abstainer as a noun:
Agent noun of abstain; 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.
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Teetotaler as a noun (US):
A person who completely abstains from alcoholic beverages.