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All answers having "Animation" as clue:

3 Character Answers:

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PEP

VIM



4 Character Answers:

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BRIO

DASH

ELAN

LIFE

ZEST

ZING



5 Character Answers:

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OOMPH

VERVE



6 Character Answers:

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SPIRIT



8 Character Answers:

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ACTIVITY

LIVENESS

VIVACITY