MAINSTREAM

Yes, MAINSTREAM is a Scrabble word!

Letter values in Scrabble US: M 3, A 1, I 1, N 1, S 1, T 1, R 1, E 1, A 1, M 3.M 3 · A 1 · I 1 · N 1 · S 1 · T 1 · R 1 · E 1 · A 1 · M 3

Is it a valid word?

• Scrabble US: valid, 14 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 14 points
• Scrabble UK: valid, 14 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 14 points
• Words with Friends: valid, 17 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 17 points