9 letters · 11 points in Scrabble
noun a person who dissents from some established policy
adjective characterized by departure from accepted beliefs or standards
adjective disagreeing, especially with a majority
originFrom Latin dissidēns, present participle of dissideō (“to sit apart; to disagree”), from dis- (“asunder, apart, in two”) + sedeō (“to sit”).
Etymology from Wiktionary, CC BY-SA 3.0