canary vs betrayer

canary and betrayer both are nouns.

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

As nouns, betrayer is a hypernym of canary; that is, betrayer is a word with a broader meaning than canary:

canary: someone acting as an informer or decoy for the police
betrayer: one who reveals confidential information to the police or other authority

Other hypernyms of canary include blabber, informer, rat, squealer.

canary (noun)	betrayer (noun)
any of several small Old World finches	a person who says one thing and does another
a moderate yellow with a greenish tinge	one who reveals confidential information to the police or other authority
a female singer
someone acting as an informer or decoy for the police

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