Yes, ANOSMIAS is a Scrabble word!

Letter values in Scrabble US: A 1, N 1, O 1, S 1, M 3, I 1, A 1, S 1.

Is it a valid word?

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

absence of the sense of smell (as by damage to olfactory nasal tissue or the olfactory nerve or by obstruction of the nasal passages)