stoolpigeon vs canary

stoolpigeon and canary both are nouns.

Word	Noun	Adjective	Verb	Adverb
stoolpigeon	Yes	No	No	No
canary	Yes	Yes	No	No

As nouns, stoolpigeon and canary are synonyms defined as:

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

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

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

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