kill vs kill off

Other hyponyms of kill include annihilate, carry off, decimate, eliminate, eradicate, extinguish, wipe out, decimate, drown, massacre, mow down, slaughter, erase, wipe out, butcher, slaughter, poison, lapidate, stone, poison, commit suicide, dispatch, vaporize, zap, sacrifice, take off, tomahawk, saber, sabre, overlay, overlie, brain, put away, put to sleep, do in, knock off, liquidate, neutralise, neutralize, waste, exterminate, asphyxiate, smother, suffocate, strangle, strangulate, throttle, behead, decapitate, decollate, impale, stake, dismember, martyr, shed blood, bump off, dispatch, hit, murder, off, polish off, remove, slay, assassinate, execute, put to death, draw, draw and quarter, quarter, lynch, pip, shoot, electrocute, fry, euthanatise, euthanatize, euthanise, euthanize, mercy kill, gank.