| quack | (noun) the harsh sound of a duck | - |
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| (noun) an untrained person who pretends to be a physician and who dispenses medical advice | - |
| quackery | (noun) medical practice and advice based on observation and experience in ignorance of scientific findings | Synonyms: empiricism |
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| (noun) the dishonesty of a charlatan | Synonyms: charlatanism |
| quackgrass | (noun) European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed | Synonyms: Agropyron repens, couch grass, dog grass, quack grass, quick grass, witch grass, witchgrass |
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