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All answers having "Part of a car" as clue:

4 Character Answers:

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AXLE

BODY

COWL

HOOD

TANK



5 Character Answers:

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TRUNK



6 Character Answers:

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FENDER

HUBCAP



7 Character Answers:

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CHASSIS

REAREND

STARTER



8 Character Answers:

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RADIATOR



9 Character Answers:

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HEADLIGHT