Subterranean vs. Underground — What's the Difference?

Situated or operating beneath the earth's surface; underground.

Situated, occurring, or operating below the surface of the earth

Hidden; secret

Hidden or concealed; clandestine

Below ground, under the earth, underground.

Of or relating to an organization involved in secret or illegal activity

(by extension) Secret, concealed.

Of or relating to an avant-garde movement or its films, publications, and art, usually privately produced and of special appeal and often concerned with social or artistic experiment.

Being or lying under the surface of the earth; situated within the earth, or under ground; as, subterranean springs; a subterraneous passage.

A clandestine, often nationalist, organization fostering or planning hostile activities against, or the overthrow of, a government in power, such as an occupying military government

Being or operating under the surface of the earth;

Chiefly British A subway system.

Lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed);

An avant-garde movement or publication.

Below the surface of the earth.

In secret; stealthily.

To situate under the ground

(not comparable) Below the ground; below the surface of the Earth.

(figurative) Hidden, furtive, secretive.

Outside the mainstream, especially unofficial and hidden from the authorities.

Below the ground.

Secretly.

(geography) Regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).

Syn of subway: a railway that is under the ground.

A movement or organisation of people who resist political convention.

A movement or organisation of people who resist artistic convention.

To route electricity distribution cables underground.

The place or space beneath the surface of the ground; subterranean space.

A subway or subway system, especially in the United Kingdom.

A secret organization opposed to the prevailing government; as, the French underground during the Nazi occupation.

A group or movement holding unorthodox views in an environment where conventional ideas dominate, as in artistic circles.

Being below the surface of the ground; as, an underground story or apartment.

Done or occurring out of sight; secret.

Beneath the surface of the earth.

A secret group organized to overthrow a government or occupation force

Electric underground railway

Under the level of the ground;

Conducted with or marked by hidden aims or methods;

Used of independent armed resistance forces;

In or into hiding or secret operation;

Beneath the surface of the earth;