Yes, tsar is in the scrabble dictionary

...and is worth 4 points by itself.

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Tsar Definition

noun

Variant of czar. See Usage Note at czar.

from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points	Points
rats	4

2 letter words with TSAR	Points
as	2
at	2
ta	2
ar	2

3 letter words with TSAR	Points
rat	3
tas	3
tar	3
sat	3
ras	3
ats	3
art	3
ars	3

4 letter words with TSAR	Points
rats	4
arts	4
star	4
tars	4
tsar	4

Found 17 words in 0.11512 seconds