field hospital vs military

field hospital and military both are nouns.

Word	Noun	Adjective	Verb	Adverb
field hospital	Yes	No	No	No
military	Yes	Yes	No	No

field hospital (noun)	military (noun)
a temporary military hospital near the battle lines	the military forces of a nation

field hospital (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