weapons system vs munition

weapons system and munition both are nouns.

Word	Noun	Adjective	Verb	Adverb
weapons system	Yes	No	No	No
munition	Yes	No	Yes	No

As nouns, weapons system and munition are synonyms defined as:

Other synonyms of weapons system include arms, implements of war, weaponry.

weapons system (noun)	munition (noun)
weapons considered collectively	weapons considered collectively
	defensive structure consisting of walls or mounds built around a stronghold to strengthen it
	military supplies

weapons system (verb)	munition (verb)
	supply with weapons