fan-jet vs turbofan engine

fan-jet and turbofan engine both are nouns.

Word	Noun	Adjective	Verb	Adverb
fan-jet	Yes	No	No	No
turbofan engine	Yes	No	No	No

As nouns, fan-jet and turbofan engine are synonyms defined as:

fan-jet and turbofan engine: a jet engine in which a fan driven by a turbine provides extra air to the burner and gives extra thrust

Other synonyms of fan-jet include fanjet, fanjet engine, turbofan, turbojet, turbojet engine.

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