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All answers having "Punctuation mark" as clue:

4 Character Answers:

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CORE

DASH

FAST

FOAL

ICED

MIST

STOP



5 Character Answers:

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APACE

AVAIL

BONUS

COLON

COMMA

EAGLE

EXTRA

KOALA

OWNED

SLASH

WITTY



6 Character Answers:

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BLEACH

HYPHEN

PERIOD

YONDER



7 Character Answers:

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ADMIRER

SATSUMA



8 Character Answers:

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FULLSTOP

LACERATE

PENCHANT

VELOCITY



9 Character Answers:

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BRONZEAGE

SEMICOLON



10 Character Answers:

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APOSTROPHE



12 Character Answers:

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ASTRONOMICAL

GROUPCAPTAIN



13 Character Answers:

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INVERTEDCOMMA