Metro
Part of speech: noun
Definition: An underground railway other than those in the US or London, in particular that in Paris. A train that runs on such an underground railway. An urban rapid transit light railway A train that runs on such a railway.
Example sentence: I emceed in metro Detroit throughout college, and even when I moved to New York, I would actually fly back on a Friday, emcee on a Saturday, and fly back on Sunday so that I could audition during the week. It was a big part of my life.
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: If you shut up truth, and bury it underground, it will but grow.