The word underground is a noun. Underground means (1) electric underground railway, (2) a secret group organized to overthrow a government or occupation force.
Underground is also an adjective that means (1) used of independent armed resistance forces, (2) under the level of the ground.
Underground is also an adverb that means (1) beneath the surface of the earth, (2) in or into hiding or secret operation.
The following articles and web pages elaborate on the word underground.
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Deep in the foothills of the Smoky Mountains, about 50 miles south of Knoxville, Tennessee, sits an wonder 140 feet below ground: the largest underground lake in America. ...
CBS News. Wednesday, 14 Aug 2019 09:04:47 -0400.
As of August 3, 2019, over 16 billion cubic meters of gas was already accumulated in Ukrainian underground gas storage facilities, reports Ukrinform. There are around 70 days until the heating season for winter begins in Ukraine. ...
Anastasia Shepeleva. Kyiv Post. Monday, 05 Aug 2019 09:22:27 +0000.
Krassner, who died July 21, published and edited the magazine The Realist from 1958 until 1974 and became known as "the father of the underground press." Originally broadcast in 1988.
Terry Gross. NPR. Tuesday, 23 Jul 2019 14:33:09 -0400.