reaction-propulsion engine vs reaction engine

reaction-propulsion engine and reaction engine both are nouns.

Word	Noun	Adjective	Verb	Adverb
reaction-propulsion engine	Yes	No	No	No
reaction engine	Yes	No	No	No

As nouns, reaction-propulsion engine and reaction engine are synonyms defined as:

reaction-propulsion engine and reaction engine: a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream

reaction-propulsion engine (noun)	reaction engine (noun)
a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream	a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream