Yes, INFERIORS is a Scrabble word!

Letter values in Scrabble US: I 1, N 1, F 4, E 1, R 1, I 1, O 1, R 1, S 1.

Is it a valid word?

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

one of lesser rank or station or quality
a character or symbol set or printed or written beneath or slightly below and to the side of another character