armed forces vs olive-drab uniform

armed forces and olive-drab uniform both are nouns.

Word	Noun	Adjective	Verb	Adverb
armed forces	Yes	No	No	No
olive-drab uniform	Yes	No	No	No

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