implements of war vs arms

implements of war and arms both are nouns.

Word	Noun	Adjective	Verb	Adverb
implements of war	Yes	No	No	No
arms	Yes	No	No	No

As nouns, implements of war and arms are synonyms defined as:

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

implements of war (noun)	arms (noun)
weapons considered collectively	weapons considered collectively
	the official symbols of a family, state, etc.