TACHYONIC

Yes, TACHYONIC is a Scrabble word!

Letter values in Scrabble US: T 1, A 1, C 3, H 4, Y 4, O 1, N 1, I 1, C 3.T 1 · A 1 · C 3 · H 4 · Y 4 · O 1 · N 1 · I 1 · C 3

Is it a valid word?

• Scrabble US: valid, 19 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 19 points
• Scrabble UK: valid, 19 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 19 points
• Words with Friends: not a valid word. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeNot a valid word