n. A person who advocates the supremacy of one particular group over all others
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a person who advocates the supremacy of some particular group or race over all others
Word Usage
"He's on record as complaining about all languages other than English being used in Cardiff, yet he manages to say Welsh speakers are 'supremacist' because they'd like two rather than one language."