Exterminator

Noun

 * 1) Someone or something that exterminates.
 * 2) Specifically, a person whose job it is to kill insects and other pests in a building.

Thesaurus
Cain, annihilator, apache, arsonist, assassin, assassinator, biblioclast, bloodletter, bloodshedder, bomber, bravo, burker, burner, butcher, button man, cannibal, cutthroat, demolisher, desperado, destroyer, dynamitard, dynamiter, eradicator, executioner, garroter, gorilla, gun, gunman, gunsel, hatchet man, head-hunter, hit man, homicidal maniac, homicide, hun, iconoclast, idol breaker, idoloclast, killer, man-eater, man-killer, manslayer, massacrer, matador, murderer, nihilist, pesticide, poison, poisoner, ruiner, slaughterer, slayer, strangler, syndicalist, terrorist, thug, torpedo, trigger man, vandal, wrecker