squealer vs informer

squealer and informer both are nouns.

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

As nouns, squealer and informer are synonyms defined as:

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

Other synonyms of squealer include betrayer, blabber, rat.

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