military vs voluntary

military and voluntary both are nouns.

Word	Noun	Adjective	Verb	Adverb
military	Yes	Yes	No	No
voluntary	Yes	Yes	No	No

military (noun)	voluntary (noun)
the military forces of a nation	composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a religious service or musical performance
	(military) a person who freely enlists for service

military (adjective)	voluntary (adjective)
associated with or performed by members of the armed services as contrasted with civilians	of your own free will or design; done by choice; not forced or compelled
characteristic of or associated with soldiers or the military	controlled by individual volition
of or relating to the study of the principles of warfare