Yes, BROWNS is a Scrabble word!

Letter values in Scrabble US: B 3, R 1, O 1, W 4, N 1, S 1.

Is it a valid word?

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

an orange of low brightness and saturation
Scottish botanist who first observed the movement of small particles in fluids now known a Brownian motion (1773-1858)
abolitionist who was hanged after leading an unsuccessful raid at Harper's Ferry, Virginia (1800-1859)
a university in Rhode Island

Also: robert brown, john brown, brown university.