Yes, FURNISHING is a Scrabble word!

Letter values in Scrabble US: F 4, U 1, R 1, N 1, I 1, S 1, H 4, I 1, N 1, G 2.

Is it a valid word?

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

(usually plural) accessory wearing apparel
(usually plural) the instrumentalities (furniture and appliances and other movable accessories including curtains and rugs) that make a home (or other area) livable
the act of decorating a house or room