Yes, HARDWARE is a Scrabble word!

Letter values in Scrabble US: H 4, A 1, R 1, D 2, W 4, A 1, R 1, E 1.

Is it a valid word?

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

major items of military weaponry (as tanks or missile)
instrumentalities (tools or implements) made of metal
(computer science) the mechanical, magnetic, electronic, and electrical components making up a computer system

Also: computer hardware.