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All answers having "___ rat" as clue:

3 Character Answers:

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LAB



4 Character Answers:

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ATAT

FINK

MALL

RACE

SING

TELL



6 Character Answers:

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SNITCH

TATTAT

TATTLE



7 Character Answers:

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SOANDSO

STOOLIE

TATTATS

TATTLER

TRAITOR



8 Character Answers:

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DESERTER

FINGERER

SQUEALER

TURNCOAT