exterminate

(verb) kill en masse; kill on a large scale; kill many. Synonyms: kill off. Example: "Hitler wanted to exterminate the jews, gypsies, communists, and homosexuals of europe."

(verb) destroy completely, as if down to the roots. Synonyms: uproot, eradicate, extirpate, root out. Example: "The vestiges of political democracy were soon uprooted" "root out corruption."