Yes, GRAHAMS is a Scrabble word!

Letter values in Scrabble US: G 2, R 1, A 1, H 4, A 1, M 3, S 1.

Is it a valid word?

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

United States evangelical preacher famous as a mass evangelist (born in 1918)
United States dancer and choreographer whose work was noted for its austerity and technical rigor (1893-1991)
flour made by grinding the entire wheat berry including the bran; (`whole meal flour' is British usage)

Also: billy graham, william franklin graham, martha graham, whole wheat flour, graham flour, whole meal flour.