fanjet engine vs turbofan

fanjet engine and turbofan both are nouns.

Word	Noun	Adjective	Verb	Adverb
fanjet engine	Yes	No	No	No
turbofan	Yes	No	No	No

As nouns, fanjet engine and turbofan are synonyms defined as:

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

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

fanjet engine (noun)	turbofan (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