Yes, COLUMN is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, L 1, U 1, M 3, N 1.

Is it a valid word?

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

a line of units following one after another
a vertical glass tube used in column chromatography; a mixture is poured in the top and washed through a stationary substance where components of the mixture are adsorbed selectively to form colored bands
a vertical array of numbers or other information
anything that approximates the shape of a column or tower
an article giving opinions or perspectives
a vertical cylindrical structure standing alone and not supporting anything (such as a monument)
(architecture) a tall vertical cylindrical structure standing upright and used to support a structure
a page or text that is vertically divided
any tubular or pillar-like supporting structure in the body

Also: chromatography column, newspaper column.