mouser

As a noun mouser is

a cat that catches mice, kept specifically for the purpose.

As nouns the difference between stalk and mouser

is that stalk is the stem or main axis of a plant, which supports the seed-carrying parts while mouser is a cat that catches mice, kept specifically for the purpose.

As a verb stalk

is to approach slowly and quietly in order not to be discovered when getting closer.

As nouns the difference between old and mouser

is that old is age while mouser is a cat that catches mice, kept specifically for the purpose.

As nouns the difference between moggy and mouser

is that moggy is a domestic non-pedigree (mongrel) cat while mouser is a cat that catches mice, kept specifically for the purpose.