case shot vs ammo

case shot and ammo both are nouns.

Word	Noun	Adjective	Verb	Adverb
case shot	Yes	No	No	No
ammo	Yes	No	No	No

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

case shot: a metallic cylinder packed with shot and used as ammunition in a firearm
ammo: projectiles to be fired from a gun

Other hypernyms of case shot include ammunition.

case shot (noun)	ammo (noun)
a metallic cylinder packed with shot and used as ammunition in a firearm	projectiles to be fired from a gun