Yes, PIMENTO is a Scrabble word!

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

Is it a valid word?

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

plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers
fully ripened sweet red pepper; usually cooked

Also: sweet pepper, bell pepper, sweet pepper plant, capsicum annuum grossum.