mole
Definitions
A small, burrowing, insectivorous mammal with dark velvety fur and very small eyes.
A small, dark, permanent growth on the human skin, typically caused by a cluster of melanocytes.
A spy who establishes cover in an organization to gain information or influence.
Examples
A small mole was digging tunnels in the backyard garden.
She has a tiny mole on her left cheek that she considers her signature beauty mark.
The intelligence agency discovered that there was a mole leaking classified information to the press.
Synonyms
spy informant double agent infiltrator secret agent turncoat traitor