Yes, zebu is a Scrabble word!
...and is worth 15 points in Scrabble, and 17 points in Words with Friends
zebu
Noun
1. Domesticated ox having a humped back and long horns and a large dewlap; used chiefly as a draft animal in India and east Asia
What Scrabble words can I make with the letters in zebu?
2 Letter Words
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Words that can be created with an extra letter added to zebu:
S:zebus