What is the difference between Jet Wash and Jet Blast?
Jet Blast is the force or wind generated behind a jet engine, particularly on or before takeoff when high/full power is set, but also when the aircraft is taxiing.



When an object moves through air (or some other medium, e.g. a spoon through nutella), air is disturbed. This disturbance or wake is known as wake turbulence. It can also be called jet wash.

The difference is that jet blast is only because of engines. Jet wash or prop wash or wake turbulence is because the airplane moves through air.

If Mr Kevin Fast runs at say 100 mph doing this (see picture below), you can notice significant wake turbulence, although the engines are off and there is no jet blast.