canister vs canister shot

canister and canister shot both are nouns.

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

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

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

Other synonyms of canister include case shot.

canister (noun)	canister shot (noun)
metal container for storing dry foods such as tea or flour	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