Is “Warn” a Scrabble word?
Yes
WARN
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Warn
/wɔːn/
verb
1.To make (someone) aware of (something impending); especially:
2.To caution or admonish (someone) against unwise or unacceptable behaviour.
“Don't let me catch you running in the corridor again, I warn you.”
3.(chiefly with "off", "away", and similar words) To advise or order to go or stay away.
“A sign warns trespassers off/away from the site.”