olive drab vs armed services

olive drab and armed services both are nouns.

Word	Noun	Adjective	Verb	Adverb
olive drab	Yes	No	No	No
armed services	Yes	No	No	No

olive drab (noun)	armed services (noun)
a cloth of an olive-brown color used for military uniforms	the military forces of a nation
military uniform of the United States Army; made from cloth of a dull olive color
a dull greyish to yellowish or light olive brown