SUBBASEMENT

Yes, SUBBASEMENT is a Scrabble word!

Letter values in Scrabble US: S 1, U 1, B 3, B 3, A 1, S 1, E 1, M 3, E 1, N 1, T 1.S 1 · U 1 · B 3 · B 3 · A 1 · S 1 · E 1 · M 3 · E 1 · N 1 · T 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: valid, 22 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 22 points