TUMBLEDOWN

Yes, TUMBLEDOWN is a Scrabble word!

Letter values in Scrabble US: T 1, U 1, M 3, B 3, L 1, E 1, D 2, O 1, W 4, N 1.T 1 · U 1 · M 3 · B 3 · L 1 · E 1 · D 2 · O 1 · W 4 · N 1

Is it a valid word?

• Scrabble US: valid, 18 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 18 points
• Scrabble UK: valid, 18 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 18 points
• Words with Friends: valid, 23 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 23 points