armed forces vs voluntary

armed forces and voluntary both are nouns.

Word	Noun	Adjective	Verb	Adverb
armed forces	Yes	No	No	No
voluntary	Yes	Yes	No	No

armed forces (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

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