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All answers having "Doodad" as clue:

5 Character Answers:

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GISMO

GIZMO

THING



6 Character Answers:

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GADGET

GEEGAW

HICKEY



7 Character Answers:

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THINGIE

TRINKET

WHATSIS

WHOOSIS



8 Character Answers:

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ORNAMENT



11 Character Answers:

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THINGAMABOB



15 Character Answers:

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WHATCHAMACALLIT