Yes, DIPLOIDS is a Scrabble word!

Letter values in Scrabble US: D 2, I 1, P 3, L 1, O 1, I 1, D 2, S 1.

Is it a valid word?

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

(genetics) an organism or cell having the normal amount of DNA per cell; i.e., two sets of chromosomes or twice the haploid number