Yes, osar is in the scrabble dictionary

...and is worth 4 points by itself.

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Osar Definition

noun

Plural of os3.

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

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Top Words by points	Points
aros	4

2 letter words with OSAR	Points
ar	2
as	2
or	2
os	2
so	2

3 letter words with OSAR	Points
aro	3
ars	3
oar	3
ora	3
ors	3
ras	3

4 letter words with OSAR	Points
aros	4
oars	4
osar	4
soar	4
sora	4

Found 16 words in 0.11171 seconds