Yes, hey is in the scrabble dictionary

...and is worth 7 points by itself.

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Hey Definition

interjection

Used to attract attention or to express surprise, appreciation, wonder, or pleasure.
from The American Heritage Dictionary of the English Language, 4th Edition

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hey

9

2 letter words with HEY

Points

eh

5

he

5

ye

5

3 letter words with HEY

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hey

9

yeh

9

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