Yes, OBEISANCE is a Scrabble word!

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

Is it a valid word?

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

bending the head or body or knee as a sign of reverence or submission or shame or greeting
the act of obeying; dutiful or submissive behavior with respect to another person