Yes, UNIFIED is a Scrabble word!

Letter values in Scrabble US: U 1, N 1, I 1, F 4, I 1, E 1, D 2.

Is it a valid word?

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

become one
to bring or combine together or with something else
bring together for a common purpose or action or ideology or in a shared situation
act in concert or unite in a common purpose or belief
join or combine

Also: co-ordinated.