/ Thesaurus / O Synonyms of otto i Find synonyms for: Noun1. Otto I, Otho I, Otto the Greatusage: King of the Germans and Holy Roman Emperor (912-973)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language