Yes, ABERRATION is a Scrabble word!

Letter values in Scrabble US: A 1, B 3, E 1, R 1, R 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

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

a state or condition markedly different from the norm
a disorder in one's mental state
an optical phenomenon resulting from the failure of a lens or mirror to produce a good image

Also: optical aberration.