Yes, SMORGASBORD is a Scrabble word!

Letter values in Scrabble US: S 1, M 3, O 1, R 1, G 2, A 1, S 1, B 3, O 1, R 1, D 2.

Is it a valid word?

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

a collection containing a variety of sorts of things
an assortment of foods starting with herring or smoked eel or salmon etc with bread and butter; then cheeses and eggs and pickled vegetables and aspics; finally hot foods; served as a buffet meal

Also: mixed bag.