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All answers having "Tyrant" as clue:

4 Character Answers:

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CZAR

NERO

OGRE

TSAR



5 Character Answers:

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ROAST

RODEO

SMART



6 Character Answers:

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DESPOT

FUHRER

MIASMA



7 Character Answers:

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PHARAOH



8 Character Answers:

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AUTOCRAT

DICTATOR



9 Character Answers:

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OPPRESSOR