mole

A naevus, a pigmented, slightly raised, and sometimes hairy spot on the skin.

Any of several small, burrowing, insectivorous mammals of the family Talpidae.

Any of the burrowing rodents also called mole-rats.

An internal spy; a person who involves themself with an enemy organisation, especially an intelligence or governmental organisation, to determine and betray its secrets from within.

A kind of self-propelled excavator used to form underground drains, or to clear underground pipelines.

A type of underground drain used in farm fields, in which a mole plow creates an unlined channel through clay subsoil.

To create a network of channels in (waterlogged soil) to improve drainage.