armed services vs voluntary

armed services and voluntary both are nouns.

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

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