military machine vs voluntary

military machine and voluntary both are nouns.

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

military machine (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 machine (adjective)	voluntary (adjective)
	of your own free will or design; done by choice; not forced or compelled
	controlled by individual volition