Yes, SCORPION is a Scrabble word!

Letter values in Scrabble US: S 1, C 3, O 1, R 1, P 3, I 1, O 1, N 1.

Is it a valid word?

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

(astrology) a person who is born while the sun is in Scorpio
the eighth sign of the zodiac; the sun is in this sign from about October 23 to November 21
arachnid of warm dry regions having a long segmented tail ending in a venomous stinger

Also: scorpio the scorpion.

Not playable in Scrabble US: SCORPIO.