underground

English Thesaurus

1. an electric railway operating below the surface of the ground (usually in a city) (noun.artifact)

hypernym	:	railroad, railroad line, railway, railway line, railway system,
definition	:	line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight (noun.artifact)

2. a secret group organized to overthrow a government or occupation force (noun.group)

hypernym	:	revolutionary group,
definition	:	a political unit organized to promote revolution (noun.group)

hyponym	:	maquis,
definition	:	the French underground that fought against the German occupation in World War II (noun.group)

3. conducted with or marked by hidden aims or methods (adj.all)

similar	:	covert,
definition	:	secret or hidden; not openly practiced or engaged in or shown or avowed (adj.all)

4. under the level of the ground (adj.all)

similar	:	subsurface,
definition	:	beneath the surface (adj.all)

5. a secret group organized to overthrow a government or occupation force (noun.group)

derivation	:	clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground,
definition	:	conducted with or marked by hidden aims or methods (adj.all)

6. conducted with or marked by hidden aims or methods (adj.all)

derivation	:	resistance, underground,
definition	:	a secret group organized to overthrow a government or occupation force (noun.group)

7. a secret group organized to overthrow a government or occupation force (noun.group)

derivation	:	clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground,
definition	:	conducted with or marked by hidden aims or methods (adj.all)

8. conducted with or marked by hidden aims or methods (adj.all)

derivation	:	resistance, underground,
definition	:	a secret group organized to overthrow a government or occupation force (noun.group)