Nouns (7)

subway system, subway, underground, tube, metro
n. an electric railway operating below the surface of the ground (usually in a city); "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
resistance, underground
n. a secret group organized to overthrow a government or occupation force

Verbs (0)

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Adverbs (2)

underground
adv. beneath the surface of the earth; "water flowing underground"
underground
adv. in or into hiding or secret operation; "the organization was driven underground"

Adjectives (15)

guerilla, guerrilla, underground, irregular
adj. (used of the military) not belonging to or engaged in by regular army forces; "irregular troops"; "irregular warfare"
hush-hush, hugger-mugger, cloak-and-dagger, hole-and-corner, underground, undercover, surreptitious, secret, clandestine
adj. conducted with or marked by hidden aims or methods; "clandestine intelligence operations"; "cloak-and-dagger activities behind enemy lines"; "hole-and-corner intrigue"; "secret missions"; "a secret agent"; "secret sales of arms"; "surreptitious mobilization of troops"; "an undercover investigation"; "underground resistance"
belowground, underground
adj. under the level of the ground; "belowground storage areas"; "underground caverns"
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