whistle blower vs informant

whistle blower and informant both are nouns.

Word	Noun	Adjective	Verb	Adverb
whistle blower	Yes	No	No	No
informant	Yes	No	No	No

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

whistle blower: an informant who exposes wrongdoing within an organization in the hope of stopping it
informant: a person who supplies information

Other hypernyms of whistle blower include source.

whistle blower (noun)	informant (noun)
an informant who exposes wrongdoing within an organization in the hope of stopping it	a person who supplies information
	someone who sees an event and reports what happened