a person, animal, or thing that catches rats, as a terrier or a cat.

1825–35; rat + -er1

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World English Dictionary
ratter (ˈrætə)
1.  a dog or cat that catches and kills rats
2.  rat another word for rat

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Kittens of a good ratter were prized because she would teach them how to hunt.
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