/ Thesaurus / P Synonyms of planktonic algae Find synonyms for: Noun1. planktonic algae, phytoplanktonusage: unicellular algaeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language