Ram-jet propulsion and Reaction propulsion

Reaction propulsion and ram-jet propulsion are semantically related in propulsion by jet discharge topic. In some cases you can use "Reaction propulsion" instead a noun phrase "Ram-jet propulsion".

Reaction propulsion noun - Propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum.

Ram-jet propulsion and reaction propulsion are semantically related in propulsion by jet discharge topic. You can use "Ram-jet propulsion" instead a noun phrase "Reaction propulsion".