Yes, PALATINES is a Scrabble word!

Letter values in Scrabble US: P 3, A 1, L 1, A 1, T 1, I 1, N 1, E 1, S 1.

Is it a valid word?

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

any of various important officials in ancient Rome
(Middle Ages) the lord of a palatinate who exercised sovereign powers over his lands
the most important of the Seven Hills of Rome; supposedly the location of the first settlement and the site of many imperial palaces
either of two irregularly shaped bones that form the back of the hard palate and helps to form the nasal cavity and the floor of the orbits

Also: palatine bone, os palatinum.