IPA: //ˈtiːˌtoʊtəlɪst//
KK: /ˈtiːˌtoʊtəlɪst/
A person who completely abstains from drinking alcohol.
As a teetotalist, she never drinks wine or beer at parties.
Teetotalist is formed from "tee" (a reduplication of the first syllable of "total") and "total" (from Latin "totus", meaning whole or entire) and the suffix "-ist" (meaning a person who practices or advocates). The term refers to a person who completely abstains from alcoholic beverages, emphasizing a total commitment to sobriety.
Think of someone who is completely 'total' ('total') in their decision to abstain from alcohol, and the '-ist' indicates they are a person who practices this lifestyle.
No commonly confused words.