Yes, BONUSES is a Scrabble word!

Letter values in Scrabble US: B 3, O 1, N 1, U 1, S 1, E 1, S 1.

Is it a valid word?

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

anything that tends to arouse
an additional payment (or other remuneration) to employees as a means of increasing output