What's the difference between nylgau and nylghau?

Nylgau

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Definition:

• (n.) A large Asiatic antelope (Boselaphus, / Portax, tragocamelus), found in Northern India. It has short horns, a black mane, and a bunch of long hair on the throat. The general color is grayish brown.

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Nylghau

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Definition:

• (n.) Alt. of Nylgau

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