blabber vs informant

blabber and informant both are nouns.

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

As nouns, informant is a hypernym of blabber; that is, informant is a word with a broader meaning than blabber:

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

Other hypernyms of blabber include source.

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

blabber (verb)	informant (verb)
speak (about unimportant matters) rapidly and incessantly