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All answers having "Similar" as clue:

4 Character Answers:

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AKIN

KISS

LIKE

ROTA

SAME

SILT

SUCH



5 Character Answers:

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ALIKE

HOMEO

INGOT



6 Character Answers:

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FASCIA



8 Character Answers:

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PARALLEL



9 Character Answers:

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ALOTALIKE

ANALOGOUS

IDENTICAL



10 Character Answers:

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COMPARABLE

STONEHENGE



11 Character Answers:

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CREDIBILITY

FUNDAMENTAL



15 Character Answers:

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LIKETWOPPINAPOD

OFTHESAMESTRIPE