vīpera

3 English words descend from Latin vīpera, most common first.

viperA venomous snake in the family Viperidae.
wyvernA draconian creature possessing wings, only two legs and usually a barbed tail.
weeverAny of the usually brown fish in family Trachinidae, which catch prey by burying themselves in the sand and snatching them as they go past.

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