Yes, tzars is a Scrabble word!
...and is worth 14 points in Scrabble, and 14 points in Words with Friends
tzars
Noun
1. A male monarch or emperor (especially of Russia prior to 1917)
What Scrabble words can I make with the letters in tzars?
4 Letter Words
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Words that can be created with an extra letter added to tzars:
E:ersatz