/ Thesaurus / B Synonyms of boris karloff Find synonyms for: Noun1. Karloff, Boris Karloff, William Henry Prattusage: United States film actor (born in England) noted for his performances in horror films (1887-1969)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language