military machine vs armoured car

military machine and armoured car both are nouns.

Word	Noun	Adjective	Verb	Adverb
military machine	Yes	No	No	No
armoured car	Yes	No	No	No

military machine (noun)	armoured car (noun)
the military forces of a nation	a military combat vehicle on wheels with light armor (and usually a machine gun)
	an armor-plated truck with strong doors and locks used to transport money or valuables