informant vs betrayer

informant and betrayer both are nouns.

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

As nouns, betrayer is a hyponym of informant; that is, betrayer is a word with a more specific, narrower meaning than informant:

informant: a person who supplies information
betrayer: one who reveals confidential information to the police or other authority

informant (noun)	betrayer (noun)
a person who supplies information	a person who says one thing and does another
someone who sees an event and reports what happened	one who reveals confidential information to the police or other authority