Yes, CHEETAH is a Scrabble word!

Letter values in Scrabble US: C 3, H 4, E 1, E 1, T 1, A 1, H 4.

Is it a valid word?

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

long-legged spotted cat of Africa and southwestern Asia having nonretractile claws; the swiftest mammal; can be trained to run down game

Also: acinonyx jubatus.