nark vs squealer

nark and squealer both are nouns.

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

As nouns, squealer is a hypernym of nark; that is, squealer is a word with a broader meaning than nark:

nark: an informer or spy working for the police
squealer: one who reveals confidential information to the police or other authority

Other hypernyms of nark include betrayer, blabber, informer, rat.

nark (noun)	squealer (noun)
an informer or spy working for the police	domestic swine
a lawman concerned with narcotics violations	one who reveals confidential information to the police or other authority

nark (verb)	squealer (verb)
inform or spy (for the police)
cause annoyance in; disturb, especially by minor irritations