Mouser

n.	1.	A cat that catches mice; as, a good mouser is better than a dozen mousetraps.
	2.	One who pries about on the lookout for something.

Noun

1.

mouser - a cat proficient at mousing

Cheshire cat, Chinchilla cat, Maltese cat, alley cat, blue cat, calico cat, cat, feline, gib, gib-cat, grimalkin, house cat, kit, kitling, kitten, kitty, kitty-cat, puss, pussy, pussycat, silver cat, tabby, tabby cat, tiger cat, tom, tomcat, tortoise-shell cat