Yes, LIVIDITIES is a Scrabble word!

Letter values in Scrabble US: L 1, I 1, V 4, I 1, D 2, I 1, T 1, I 1, E 1, S 1.

Is it a valid word?

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

a state of fury so great the face becomes discolored
unnatural lack of color in the skin (as from bruising or sickness or emotional distress)

Not playable in Scrabble US: ACHROMASIA.