Yes, ATTRACTER is a Scrabble word!

Letter values in Scrabble US: A 1, T 1, T 1, R 1, A 1, C 3, T 1, E 1, R 1.

Is it a valid word?

ATTRACTER is a valid word in the official Scrabble dictionary (US) and the UK Scrabble Dictionary, but not in Words with Friends (ENABLE).

an entertainer who attracts large audiences
(physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system
a characteristic that provides pleasure and attracts

Also: drawing card, attractive feature.