Yes, DEFICITS is a Scrabble word!

Letter values in Scrabble US: D 2, E 1, F 4, I 1, C 3, I 1, T 1, S 1.

Is it a valid word?

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

the property of being an amount by which something is less than expected or required
a deficiency or failure in neurological or mental functioning
(sports) the score by which a team or individual is losing
an excess of liabilities over assets (usually over a certain period)