IPA: /səˈprɛməsɪst/
KK: /səˈprɛməsɪst/
A person who believes that a particular group of people is better or more important than others.
The supremacist held extreme views about the superiority of his race.
Supremacist → It is formed from "supreme" (from Latin *supremus*, meaning highest or greatest) and the suffix "-ist" (meaning one who practices or is concerned with). A supremacist is someone who believes in the superiority of a particular group, often in a social or political context.
Think of someone who believes in being the 'highest' ('supreme') in status or power, and the '-ist' indicates a person who holds that belief.