ubukūmbi     8  class 8
singular: ubu-
  
(no pl.) pile of mixed grain and chaff
chaff    umuguruka, umurāyi
(fan to blow off) urutaro
(mixed with grain) ibikūmbi
(pile of chaff and grain) ubukūmbi
(to blow out) kugosōra
(to rub grain to take off) kuvūngura
En-En dictionary 
pile    ikirūndo
(of grain) amarwi
(of grain and chaff mixed) ubukūmbi
(of rocks) igihongo
(of wood) akarwi
En-En dictionary