fanjet engine vs turbofan engine

fanjet engine and turbofan engine both are nouns.

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

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

fanjet engine 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 fanjet engine include fan-jet, fanjet, turbofan, turbojet, turbojet engine.

fanjet engine (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