Yes, thro is in the scrabble dictionary

...and is worth 6 points by itself.

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Thro Definition

preposition

Through.
from the English-language Wiktionary

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Top Words by points

Points

thro

7

2 letter words with THRO

Points

ho

5

oh

5

or

2

to

2

3 letter words with THRO

Points

hot

6

ort

3

rho

6

rot

3

tho

6

tor

3

4 letter words with THRO

Points

thro

7

Found 11 words in 0.13094 seconds