stool pigeon vs canary

stool pigeon and canary both are nouns.

Word	Noun	Adjective	Verb	Adverb
stool pigeon	Yes	No	No	No
canary	Yes	Yes	No	No

As nouns, stool pigeon and canary are synonyms defined as:

stool pigeon and canary: someone acting as an informer or decoy for the police

Other synonyms of stool pigeon include fink, sneak, sneaker, snitch, snitcher, stoolie, stoolpigeon.

stool pigeon (noun)	canary (noun)
a dummy pigeon used to decoy others	any of several small Old World finches
someone acting as an informer or decoy for the police	a moderate yellow with a greenish tinge
	a female singer
	someone acting as an informer or decoy for the police

stool pigeon (adjective)	canary (adjective)
	having the color of a canary; of a light to moderate yellow