Yes, ENDOMETRIA is a Scrabble word!

Letter values in Scrabble US: E 1, N 1, D 2, O 1, M 3, E 1, T 1, R 1, I 1, A 1.

Is it a valid word?

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

(pregnancy) the mucous membrane that lines the uterus; thickens under hormonal control and (if pregnancy does not occur) is shed in menstruation; if pregnancy occurs it is shed along with the placenta at parturition