Yes, ALIENATION is a Scrabble word!

Letter values in Scrabble US: A 1, L 1, I 1, E 1, N 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

ALIENATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the feeling of being alienated from other people
separation resulting from hostility
(law) the voluntary and absolute transfer of title and possession of real property from one person to another
the action of alienating; the action of causing to become unfriendly