EXTINGUISH

Yes, EXTINGUISH is a Scrabble word!

Letter values in Scrabble US: E 1, X 8, T 1, I 1, N 1, G 2, U 1, I 1, S 1, H 4.E 1 · X 8 · T 1 · I 1 · N 1 · G 2 · U 1 · I 1 · S 1 · H 4

Is it a valid word?

• Scrabble US: valid, 21 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 21 points
• Scrabble UK: valid, 21 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 21 points
• Words with Friends: valid, 23 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 23 points