Royalist
Part of speech: noun
Definition: A monarchist (supporter of monarchy) or supporter of a particular royal regime. Can carry the connotation of a legitimist, a supporter of a particular royal line, especially one in danger of being dispossessed of a throne or actually dispossessed of such, and claiming to have the better claim to the throne on the basis of line of descent. Especially:
Monarchist
Part of speech: noun
Definition: An advocate of, or believer in, monarchy.