say it: soo-PREM-uh-sist
supremacist is a noun meaning "a person who advocates the supremacy of some particular group or racial group over all others". It carries one recorded sense.
a person who advocates the supremacy of some particular group or racial group over all others
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for supremacist come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.