Yes, ERGOTISM is a Scrabble word!

Letter values in Scrabble US: E 1, R 1, G 2, O 1, T 1, I 1, S 1, M 3.

Is it a valid word?

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

poisoning by ingestion of ergot-infected grain products; characterized by thirst and diarrhea and nausea and cramping and vomiting and abnormal cardiac rhythms; in severe cases it can cause seizures and gangrene of the limbs