canister shot vs case shot

canister shot and case shot both are nouns.

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

As nouns, canister shot and case shot are synonyms defined as:

canister shot and case shot: a metallic cylinder packed with shot and used as ammunition in a firearm

Other synonyms of canister shot include canister.

canister shot (noun)	case shot (noun)
a metallic cylinder packed with shot and used as ammunition in a firearm	a metallic cylinder packed with shot and used as ammunition in a firearm