/ Thesaurus / P Synonyms of penobscot river Find synonyms for: Noun1. Penobscot, Penobscot Riverusage: a river in central Maine flowing into Penobscot BayWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language