olive drab vs military uniform

olive drab and military uniform both are nouns.

Word	Noun	Adjective	Verb	Adverb
olive drab	Yes	No	No	No
military uniform	Yes	No	No	No

As nouns, military uniform is a hypernym of olive drab; that is, military uniform is a word with a broader meaning than olive drab:

olive drab: military uniform of the United States Army; made from cloth of a dull olive color
military uniform: prescribed identifying uniform for soldiers

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