Yes, TURBOFANS is a Scrabble word!

Letter values in Scrabble US: T 1, U 1, R 1, B 3, O 1, F 4, A 1, N 1, S 1.

Is it a valid word?

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

an airplane propelled by a fanjet engine
a jet engine in which a fan driven by a turbine provides extra air to the burner and gives extra thrust

Also: fan-jet, fanjet engine, turbojet engine, turbofan engine.