Yes, warn is in the scrabble dictionary

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Warn Definition

verb-transitive

To admonish as to action or manners.
from The American Heritage Dictionary of the English Language, 4th Edition
To make aware in advance of actual or potential harm, danger, or evil.
from The American Heritage Dictionary of the English Language, 4th Edition
To notify (a person) to go or stay away: warned them off the posted property.
from The American Heritage Dictionary of the English Language, 4th Edition
To notify or apprise in advance: They called and warned me that they might be delayed.
from The American Heritage Dictionary of the English Language, 4th Edition

verb-intransitive

To give a warning.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To give notice to beforehand especially of danger or evil.
from Free Scrabble Dictionary
To give admonishing advice to.
from Free Scrabble Dictionary
To call to one's attention.
from Free Scrabble Dictionary
To order to go or stay away.
from Free Scrabble Dictionary
To give a.
from Free Scrabble Dictionary

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Top Words by points

Points

warn

7

2 letter words with WARN

Points

an

2

ar

2

aw

5

na

2

3 letter words with WARN

Points

awn

6

naw

6

ran

3

raw

6

wan

6

war

6

4 letter words with WARN

Points

warn

7

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