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killer has 7 distinct synonyms spread across 3 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.
Synonyms, antonyms and the broader and narrower relations for killer come from Princeton University’s WordNet. Full sources and licences.
the causal agent resulting in death
“heart disease is the biggest killer in the United States”
a difficulty that is hard to deal with
“that exam was a real killer”
predatory black-and-white toothed whale with large dorsal fin; common in cold seas