informer vs squealer

informer and squealer both are nouns.

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

As nouns, informer and squealer are synonyms defined as:

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

Other synonyms of informer include betrayer, blabber, rat.

informer (noun)	squealer (noun)
one who reveals confidential information to the police or other authority	domestic swine
	one who reveals confidential information to the police or other authority