armament vs weapons system

armament and weapons system both are nouns.

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

As nouns, weapons system is a hypernym of armament; that is, weapons system is a word with a broader meaning than armament:

Other hypernyms of armament include arms, implements of war, munition, weaponry.

armament (noun)	weapons system (noun)
the act of equipping with weapons in preparation for war	weapons considered collectively
weaponry used by military or naval force