Yes, oh is in the scrabble dictionary

...and is worth 4 points by itself.

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Oh Definition

noun

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

interjection

Used in direct address: Oh, sir! You forgot your keys.
from The American Heritage Dictionary of the English Language, 4th Edition
Used to express strong emotion, such as surprise, fear, anger, or pain.
from The American Heritage Dictionary of the English Language, 4th Edition
Used to indicate understanding or acknowledgment of a statement.
from The American Heritage Dictionary of the English Language, 4th Edition

abbreviation

Ohio.
from Free Scrabble Dictionary

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Top Words by points

Points

ho

5

2 letter words with OH

Points

ho

5

oh

5

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