ammunition vs weapons system

ammunition and weapons system both are nouns.

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

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

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

ammunition (noun)	weapons system (noun)
projectiles to be fired from a gun	weapons considered collectively
information that can be used to attack or defend a claim or argument or viewpoint
any nuclear or chemical or biological material that can be used as a weapon of mass destruction