/ Thesaurus / R Synonyms of regulus calendula Find synonyms for: Noun1. ruby-crowned kinglet, ruby-crowned wren, Regulus calendula, kingletusage: American kinglet with a notable song and in the male a red crown patchWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language