case shot vs canister

case shot and canister both are nouns.

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

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

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

Other synonyms of case shot include canister shot.

case shot (noun)	canister (noun)
a metallic cylinder packed with shot and used as ammunition in a firearm	metal container for storing dry foods such as tea or flour
	a metallic cylinder packed with shot and used as ammunition in a firearm