11 letters · 20 points in Scrabble
verb kill en masse; kill on a large scale; kill many
verb destroy completely, as if down to the roots
originBorrowed from Latin exterminātus, perfect passive participle of exterminō (see -ate (verb-forming suffix)), from ex- (“thoroughly”) + terminō (“to finish, close, end”), from terminus (“limit, end”) + -ō (verb-forming suffix).
Etymology from Wiktionary, CC BY-SA 3.0