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All answers having "Greenish blue" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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AQUA

CYAN

NILE

SAXE

TEAL



5 Character Answers:

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CAPRI

EMAIL



8 Character Answers:

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BERYLINE



9 Character Answers:

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ROBINSEGG

TURQUOISE