OBSERVATIONAL

Yes, OBSERVATIONAL is a Scrabble word!

Letter values in Scrabble US: O 1, B 3, S 1, E 1, R 1, V 4, A 1, T 1, I 1, O 1, N 1, A 1, L 1.O 1 · B 3 · S 1 · E 1 · R 1 · V 4 · A 1 · T 1 · I 1 · O 1 · N 1 · A 1 · L 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, 22 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 22 points