SEMAPHORE

Yes, SEMAPHORE is a Scrabble word!

Letter values in Scrabble US: S 1, E 1, M 3, A 1, P 3, H 4, O 1, R 1, E 1.S 1 · E 1 · M 3 · A 1 · P 3 · H 4 · O 1 · R 1 · E 1

Is it a valid word?

• Scrabble US: valid, 16 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 16 points
• Scrabble UK: valid, 16 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 16 points
• Words with Friends: valid, 17 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 17 points