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All answers having "Imitator" as clue:

3 Character Answers:

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APE



4 Character Answers:

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APER

ECHO

MIME



5 Character Answers:

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MIMER

MIMIC



6 Character Answers:

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COPIER

ECHOER



7 Character Answers:

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COPYCAT



8 Character Answers:

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PARROTER