ground forces vs military

ground forces and military both are nouns.

Word	Noun	Adjective	Verb	Adverb
ground forces	Yes	No	No	No
military	Yes	Yes	No	No

ground forces (noun)	military (noun)
a permanent organization of the military land forces of a nation or state	the military forces of a nation

ground forces (adjective)	military (adjective)
	associated with or performed by members of the armed services as contrasted with civilians
	characteristic of or associated with soldiers or the military
	of or relating to the study of the principles of warfare