Yes, ORDEAL is a Scrabble word!

Letter values in Scrabble US: O 1, R 1, D 2, E 1, A 1, L 1.

Is it a valid word?

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

a severe or trying experience
a primitive method of determining a person's guilt or innocence by subjecting the accused person to dangerous or painful tests believed to be under divine control; escape was usually taken as a sign of innocence

Also: trial by ordeal.