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underground has 14 distinct synonyms spread across 4 of its 6 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a secret group organized to overthrow a government or occupation force
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'”
conducted with or marked by hidden aims or methods
“clandestine intelligence operations”
2 of the 6 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for underground.
Synonyms, antonyms and the broader and narrower relations for underground come from Princeton University’s WordNet. Full sources and licences.