What's the noun for muzzles? Here's the word you're looking for.
muzzle
The protruding part of many animal's head which includes nose, mouth and jaws; snout
The mouth or the end for entrance or discharge of a gun, pistol etc., that the bullet emerges from as opposed to the breech.
A device used to prevent animal from biting or eating, which is worn on its snout.
(chiefly Scotland) A piece of the forward end of the plow-beam by which the traces are attached; bridle
(obsolete, historical) An openwork covering for the nose, used for the defense of the horse, and forming part of the bards in the 15th and 16th centuries.