Sirius is related to Star in the same way as Cygnus is related to.........

Choose the correct alternative for the word belongs to the same group.

Peat : Lignite : Bituminous

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Theft : Confess

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Crown : Royal

Leisurely is related to Unhurried in the same way as Tardy is related to........?

Choose the correct alternative for the given relation.

Nightingale : Warble : : Frog : ?