/ Thesaurus / C Synonyms of carbon 14 Find synonyms for: Noun1. radiocarbon, carbon 14, carbon, C, atomic number 6usage: a radioactive isotope of carbonWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language