Mouser (noun)

1. A cat that catches mice.
2. A person who hunts or traps mice.

Origin:

From the old english mus, meaning 'mouse', and -er, a suffix used to form nouns indicating a person who performs a certain action.

Examples:

1. The farmer's mouser was a fierce feline, always on the prowl for mice.
2. The mouser leapt from the windowsill and disappeared into the fields in pursuit of its prey.
3. The mouse-infested barn was no match for the clever mouser.
4. The mouser snuck up on the mouse and pounced, ending the rodent's raid on the pantry.
5. The children loved watching the mouser do its work, bringing back mice as gifts for their approval.