Yes, DIRECTER is a Scrabble word!

Letter values in Scrabble US: D 2, I 1, R 1, E 1, C 3, T 1, E 1, R 1.

Is it a valid word?

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

direct in spatial dimensions; proceeding without deviation or interruption; straight and short
having no intervening persons, agents, conditions
straightforward in means or manner or behavior or language or action
in a straight unbroken line of descent from parent to child
moving from west to east on the celestial sphere; or--for planets--around the sun in the same direction as the Earth
similar in nature or effect or relation to another quantity
(of a current) flowing in one direction only
being an immediate result or consequence
in precisely the same words used by a writer or speaker
lacking compromising or mitigating elements; exact