What's the difference between poachard and pochard?

Poachard

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Definition:

• (n.) A common European duck (Aythya ferina); -- called also goldhead, poker, and fresh-water, / red-headed, widgeon.
• (n.) The American redhead, which is closely allied to the European poachard.

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Pochard

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Definition:

• (n.) See Poachard.

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