Yes, FUGUES is a Scrabble word!

Letter values in Scrabble US: F 4, U 1, G 2, U 1, E 1, S 1.

Is it a valid word?

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

dissociative disorder in which a person forgets who they are and leaves home to creates a new life; during the fugue there is no memory of the former life; after recovering there is no memory for events during the dissociative state
a dreamlike state of altered consciousness that may last for hours or days
a musical form consisting of a theme repeated a fifth above or a fourth below its first statement

Also: psychogenic fugue.