Yes, LABDANUMS is a Scrabble word!

Letter values in Scrabble US: L 1, A 1, B 3, D 2, A 1, N 1, U 1, M 3, S 1.

Is it a valid word?

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

a dark brown to greenish oleoresin that has a fragrant odor and is used as a fixative in perfumes; obtained as a juice from certain rockroses
a soft blackish-brown resinous exudate from various rockroses used in perfumes especially as a fixative

Also: gum labdanum.