Yes, ENTREPOT is a Scrabble word!

Letter values in Scrabble US: E 1, N 1, T 1, R 1, E 1, P 3, O 1, T 1.

Is it a valid word?

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

a port where merchandise can be imported and then exported without paying import duties
a depository for goods

Also: transshipment center.