squealer vs betrayer

squealer and betrayer both are nouns.

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

As nouns, squealer and betrayer are synonyms defined as:

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

Other synonyms of squealer include blabber, informer, rat.

squealer (noun)	betrayer (noun)
domestic swine	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