Yes, BIGARADE is a Scrabble word!

Letter values in Scrabble US: B 3, I 1, G 2, A 1, R 1, A 1, D 2, E 1.

Is it a valid word?

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

any of various common orange trees yielding sour or bitter fruit; used as grafting stock

Also: sour orange, seville orange, bitter orange, bitter orange tree, marmalade orange, citrus aurantium.