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All answers having "Bubbles" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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FIZZ

FOAM

ORBS

SOAP

SUDS



5 Character Answers:

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BLOBS

BOILS

FOAMS

FROTH



6 Character Answers:

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FROTHS

LATHER



7 Character Answers:

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SIMMERS