Yes, VIOLIN is a Scrabble word!

Letter values in Scrabble US: V 4, I 1, O 1, L 1, I 1, N 1.

Is it a valid word?

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

bowed stringed instrument that is the highest member of the violin family; this instrument has four strings and a hollow body and an unfretted fingerboard and is played with a bow