tattle

As nouns the difference between telltale and tattle

is that telltale is one who divulges private information with intent to hurt others while tattle is a tattletale.

As an adjective telltale

is revealing something not intended to be known.

As a verb tattle is

(pejorative) to report others' wrongdoings or violations; to tell on somebody; to gossip or to disclose incriminating information.