turbojet vs turbojet engine

turbojet and turbojet engine both are nouns.

Word	Noun	Adjective	Verb	Adverb
turbojet	Yes	No	No	No
turbojet engine	Yes	No	No	No

As nouns, turbojet and turbojet engine are synonyms defined as:

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

turbojet (noun)	turbojet 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