informer vs betrayer

informer and betrayer both are nouns.

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

As nouns, informer and betrayer are synonyms defined as:

informer and betrayer: one who reveals confidential information to the police or other authority

Other synonyms of informer include blabber, rat, squealer.

informer (noun)	betrayer (noun)
one who reveals confidential information to the police or other authority	a person who says one thing and does another
	one who reveals confidential information to the police or other authority