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All answers having "Projection" as clue:

3 Character Answers:

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ARM

EAR

JUT



4 Character Answers:

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EAVE

LIMB

LOBE

SPUR

TINE



5 Character Answers:

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BULGE

IMAGE

LEDGE

PRONG

TENON



6 Character Answers:

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ASTRAL



8 Character Answers:

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OVERHANG

SALIENCE