munition vs arms

munition and arms both are nouns.

Word	Noun	Adjective	Verb	Adverb
munition	Yes	No	Yes	No
arms	Yes	No	No	No

As nouns, munition and arms are synonyms defined as:

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

munition (noun)	arms (noun)
weapons considered collectively	weapons considered collectively
defensive structure consisting of walls or mounds built around a stronghold to strengthen it	the official symbols of a family, state, etc.
military supplies

munition (verb)	arms (verb)
supply with weapons