ammo vs weaponry

ammo and weaponry both are nouns.

Word	Noun	Adjective	Verb	Adverb
ammo	Yes	No	No	No
weaponry	Yes	No	No	No

As nouns, weaponry is a hypernym of ammo; that is, weaponry is a word with a broader meaning than ammo:

Other hypernyms of ammo include arms, implements of war, munition, weapons system.

ammo (noun)	weaponry (noun)
projectiles to be fired from a gun	weapons considered collectively