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hydra has 1 distinct synonym spread across 1 of its 4 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.
(Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones
“Hydra was slain by Hercules”
a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer
trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality
“we may be facing a hydra that defies any easy solution”
small tubular solitary freshwater hydrozoan polyp
Synonyms, antonyms and the broader and narrower relations for hydra come from Princeton University’s WordNet. Full sources and licences.