armoured car vs military machine

armoured car and military machine both are nouns.

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

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