weaponry vs weapons system

weaponry and weapons system both are nouns.

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

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

Other synonyms of weaponry include arms, implements of war, munition.

weaponry (noun)	weapons system (noun)
weapons considered collectively	weapons considered collectively