Yes, ORDERLIES is a Scrabble word!

Letter values in Scrabble US: O 1, R 1, D 2, E 1, R 1, L 1, I 1, E 1, S 1.

Is it a valid word?

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

a soldier who serves as an attendant to a superior officer
a male hospital attendant who has general duties that do not involve the medical treatment of patients

Also: hospital attendant.