/ Thesaurus / H Synonyms of high treason Find synonyms for: Noun1. treason, high treason, lese majesty, crime, offense, criminal offense, criminal offence, offence, law-breakingusage: a crime that undermines the offender's governmentWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: fortuitous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language