Yes, SACRUMS is a Scrabble word!

Letter values in Scrabble US: S 1, A 1, C 3, R 1, U 1, M 3, S 1.

Is it a valid word?

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

wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx