Yes, thru is in the scrabble dictionary

...and is worth 7 points by itself.

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Thru Definition

preposition

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

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Top Words by points

Points

hurt

7

2 letter words with THRU

Points

uh

5

ut

2

3 letter words with THRU

Points

hut

6

rut

3

4 letter words with THRU

Points

hurt

7

ruth

7

thru

7

Found 7 words in 0.11098 seconds