Yes, ANOMALY is a Scrabble word!

Letter values in Scrabble US: A 1, N 1, O 1, M 3, A 1, L 1, Y 4.

Is it a valid word?

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

deviation from the normal or common order or form or rule
a person who is unusual
(astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun)

Also: unusual person.