When the words vipūya , vinīya and jityā are irregularly formed they mean 'the muñja grass', 'the sediment' and 'the plough', respectively.,
Thus वि + पू + क्यप् = विपूयः etymologically 'that which has to be purified to make rope'; वि + नी + क्यप् =विनीय 'a sediment or sin'; जि + क्यप् = जित्य 'a plough that which is to be conquered by strength'.
The regular derivatives are विपाव्यम्, विनेयम् and जेयम्.,