Yes, ACCORDION is a Scrabble word!

Letter values in Scrabble US: A 1, C 3, C 3, O 1, R 1, D 2, I 1, O 1, N 1.

Is it a valid word?

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

a portable box-shaped free-reed instrument; the reeds are made to vibrate by air from the bellows controlled by the player

Also: piano accordion, squeeze box.