Yes, BELLOWS is a Scrabble word!

Letter values in Scrabble US: B 3, E 1, L 1, L 1, O 1, W 4, S 1.

Is it a valid word?

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

a mechanical device that blows a strong current of air; used to make a fire burn more fiercely or to sound a musical instrument
a very loud utterance (like the sound of an animal)
United States author (born in Canada) whose novels influenced American literature after World War II (1915-2005)

Also: saul bellow, solomon bellow.