Yes, ALBUMEN is a Scrabble word!

Letter values in Scrabble US: A 1, L 1, B 3, U 1, M 3, E 1, N 1.

Is it a valid word?

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

a simple water-soluble protein found in many animal tissues and liquids
the white part of an egg; the nutritive and protective gelatinous substance surrounding the yolk consisting mainly of albumin dissolved in water

Also: egg white.