Yes, ENAMELS is a Scrabble word!

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

Is it a valid word?

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

hard white substance covering the crown of a tooth
a colored glassy compound (opaque or partially opaque) that is fused to the surface of metal or glass or pottery for decoration or protection
a paint that dries to a hard glossy finish
any smooth glossy coating that resembles ceramic glaze

Also: tooth enamel.