weapons system vs implements of war

weapons system and implements of war both are nouns.

Word	Noun	Adjective	Verb	Adverb
weapons system	Yes	No	No	No
implements of war	Yes	No	No	No

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

Other synonyms of weapons system include arms, munition, weaponry.

weapons system (noun)	implements of war (noun)
weapons considered collectively	weapons considered collectively