Yes, CERVIX is a Scrabble word!

Letter values in Scrabble US: C 3, E 1, R 1, V 4, I 1, X 8.

Is it a valid word?

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

the part of an organism (human or animal) that connects the head to the rest of the body
necklike opening to the uterus

Also: uterine cervix, cervix uteri.