A spy, an informer/snitch. Someone who penetrates/enters a circle of friends or organization for the sole purpose of gathering sensitive or classified information and leaking it to an opposing or competing group.
Synonyms for Mole
On this page, you will find 30 slang terms related to a mole. Some of the top words include: peep show, all in the Kool Aid and don't even know the flava, rat, suspect, kayfabe, and 25 more.