field day vs military

field day and military both are nouns.

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

field day (noun)	military (noun)
a day for outdoor athletic competition	the military forces of a nation
a day devoted to an outdoor social gathering
(military) a day for military exercises and display
a time of unusual pleasure and success

field day (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