Yes, PARABLE is a Scrabble word!

Letter values in Scrabble US: P 3, A 1, R 1, A 1, B 3, L 1, E 1.

Is it a valid word?

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

a short moral story (often with animal characters)
(New Testament) any of the stories told by Jesus to convey his religious message