SUPPOSITION

Yes, SUPPOSITION is a Scrabble word!

Letter values in Scrabble US: S 1, U 1, P 3, P 3, O 1, S 1, I 1, T 1, I 1, O 1, N 1.S 1 · U 1 · P 3 · P 3 · O 1 · S 1 · I 1 · T 1 · I 1 · O 1 · N 1

Is it a valid word?

• Scrabble US: valid, 15 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 15 points
• Scrabble UK: valid, 15 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 15 points
• Words with Friends: valid, 19 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 19 points