Yes, PASSPORT is a Scrabble word!

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

Is it a valid word?

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

any authorization to pass or go somewhere
a document issued by a country to a citizen allowing that person to travel abroad and re-enter the home country
any quality or characteristic that gains a person a favorable reception or acceptance or admission