olive-drab uniform vs war machine

olive-drab uniform and war machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
olive-drab uniform	Yes	No	No	No
war machine	Yes	No	No	No

olive-drab uniform (noun)	war machine (noun)
military uniform of the United States Army; made from cloth of a dull olive color	the military forces of a nation