betrayer vs informer

betrayer and informer both are nouns.

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

As nouns, betrayer and informer are synonyms defined as:

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

Other synonyms of betrayer include blabber, rat, squealer.

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