Yes, SUPERFUND is a Scrabble word!

Letter values in Scrabble US: S 1, U 1, P 3, E 1, R 1, F 4, U 1, N 1, D 2.

Is it a valid word?

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

the federal government's program to locate and investigate and clean up the worst uncontrolled and abandoned toxic waste sites nationwide; administered by the Environmental Protection Agency

Also: superfund program.