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All answers having "Immense" as clue:

3 Character Answers:

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BIG



4 Character Answers:

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HUGE

VAST



5 Character Answers:

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ENORM

GIANT

GREAT

JUMBO

LARGE

MONDO



6 Character Answers:

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COSMIC



7 Character Answers:

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OCEANIC

TITANIC



8 Character Answers:

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ENORMOUS

GALACTIC

WHOPPING



10 Character Answers:

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GIANTESQUE



11 Character Answers:

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ELEPHANTINE