Underground
Part of speech: adverb
Definition: Below the ground. Secretly.
Part of speech: adjective
Definition: Below the ground; below the surface of the Earth. Hidden, furtive, secretive. Of music, art, etc, outside the mainstream.
Part of speech: noun
Definition: An underground railway. (with the) A movement or organisation of people who resist political convention. (with the) A movement or organisation of people who resist artistic convention.
Example sentence: Speak the truth, and all things alive or brute are vouchers, and the very roots of the grass underground there, do seem to stir and move to bear you witness.
Tube
Part of speech: noun
Definition: Anything that is hollow and cylindrical in shape.An approximately cylindrical container, usually with a crimped end and a screw top, used to contain and dispense semi-liquid substances.The London Underground railway system, originally referred to the lower level lines that ran in tubular tunnels as opposed to the higher ones which ran in rectangular section tunnels. (Often the tube.)A tin can containing beer (or other beverage?)A wave which pitches forward when breaking, creating a hollow space inside.A television. Also, derisively, boob tube. British: telly
Part of speech: verb
Definition: To make or use tubes
Example sentence: When I'm online, I'm alone in a room, tapping on a keyboard, staring at a cathode-ray tube.