Yes, CRUCIFIX is a Scrabble word!

Letter values in Scrabble US: C 3, R 1, U 1, C 3, I 1, F 4, I 1, X 8.

Is it a valid word?

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

representation of the cross on which Jesus died
a gymnastic exercise performed on the rings when the gymnast supports himself with both arms extended horizontally

Also: rood-tree.