Yes, tzar is a Scrabble word!
...and is worth 13 points in Scrabble, and 13 points in Words with Friends
tzar
Noun
1. A male monarch or emperor (especially of Russia prior to 1917)
What Scrabble words can I make with the letters in tzar?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to tzar:
S:tzars