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All answers having "Breather" as clue:

4 Character Answers:

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GILL

LULL

LUNG

NOSE

REST



5 Character Answers:

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LETUP

PAUSE



6 Character Answers:

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AEROBE



7 Character Answers:

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AIRTUBE

RESPITE



8 Character Answers:

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AQUALUNG



10 Character Answers:

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OXYGENMASK