DIPHTHEROID

Yes, DIPHTHEROID is a Scrabble word!

Letter values in Scrabble US: D 2, I 1, P 3, H 4, T 1, H 4, E 1, R 1, O 1, I 1, D 2.D 2 · I 1 · P 3 · H 4 · T 1 · H 4 · E 1 · R 1 · O 1 · I 1 · D 2

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, 20 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 20 points