Yes, VAPORIZING is a Scrabble word!

Letter values in Scrabble US: V 4, A 1, P 3, O 1, R 1, I 1, Z 10, I 1, N 1, G 2.

Is it a valid word?

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

kill with or as if with a burst of gunfire or electric current or as if by shooting
turn into gas
lose or cause to lose liquid by vaporization leaving a more concentrated residue
decrease rapidly and disappear