Yes, APOSTROPHE is a Scrabble word!

Letter values in Scrabble US: A 1, P 3, O 1, S 1, T 1, R 1, O 1, P 3, H 4, E 1.

Is it a valid word?

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

address to an absent or imaginary person
the mark (') used to indicate the omission of one or more letters from a printed word