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All answers having "Perceive" as clue:

3 Character Answers:

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GET

SEE

SPY



4 Character Answers:

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ESPY

FEEL

KNOW

NOTE



5 Character Answers:

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GRASP

INALL

SENSE

SMELL



6 Character Answers:

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DESCRY

DETECT

NOTICE



7 Character Answers:

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COGNIZE

DISCERN



9 Character Answers:

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APPREHEND