As nouns the difference between whistleblower and tattletale
is that whistleblower is while tattletale is one who tattles (reports others' wrongdoings), often by a child seeking attention.
As an adjective tattletale is
telltale, giveaway.
tattletale
English
Adjective
(-)
telltale, giveaway
Noun
(
en noun)
One who tattles (reports others' wrongdoings), often by a child seeking attention.
One who gossips, often for the sake of attention.
Synonyms
* (one who tattles ): tattler, whistle-blower, narc, snitch
* See also