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smoothness▼(condition of being smooth)noun[UK: ˈsmuːð.nəs] [US: ˈsmuːð.nəs]
slipperiness▼(property of being slippery)noun[UK: ˈslɪ.pə.rɪ.nəs] [US: ˈslɪ.pə.rɪ.nəs]
smooth▼(something which is smooth or easy)noun[UK: smuːð] [US: ˈsmuːð]
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