"witchgrasses" in the noun sense
1. witchgrass, witch grass, old witchgrass, old witch grass, tumble grass, Panicum capillare
North American grass with slender brushy panicles often a weed on cultivated land
2. dog grass, couch grass, quackgrass, quack grass, quick grass, witch grass, witchgrass, Agropyron repens
European grass spreading rapidly by creeping rhizomes naturalized in North America as a weed
Source: WordNet® (An amazing lexical database of English)
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