BACKSTAIR

Yes, BACKSTAIR is a Scrabble word!

Letter values in Scrabble US: B 3, A 1, C 3, K 5, S 1, T 1, A 1, I 1, R 1.B 3 · A 1 · C 3 · K 5 · S 1 · T 1 · A 1 · I 1 · R 1

Is it a valid word?

• Scrabble US: valid, 17 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 17 points
• Scrabble UK: valid, 17 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 17 points
• Words with Friends: not a valid word. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeNot a valid word