/ Thesaurus / P Synonyms of phylum chaetognatha Find synonyms for: Noun1. Chaetognatha, phylum Chaetognatha, phylumusage: arrowworms: a group of small active transparent marine wormsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language