Yes, PELVIS is a Scrabble word!

Letter values in Scrabble US: P 3, E 1, L 1, V 4, I 1, S 1.

Is it a valid word?

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

the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates
a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter

Also: pelvic girdle, pelvic arch, renal pelvis.