Synonyms for Snuff out:

n.

kill off, cut into, hold back, interfere with, shut off, squeeze out, suppress. put out, beat out, douse, fight a fire/blaze, smother, stamp out, tackle. snuff out (noun)
extinguish.

Other synonyms:

douse. Other relevant words:
douse, stamp out, suppress, smother, extinguish, put out.