ubutumba     8  class 8
singular: ubu-
  
(no pl.) little hills, knolls
 ubutumba : Prefixless Present 2. pers. sing. with 8.class sg. object of:
gutumba (-tumvye)   v    to swell
hill    umusozi, umudūgo, umutumba
(brow of) igikombe
(of earth, to plant in) iburi
(slope of) inkūka, akamanuko, umurwa
(top of) impīnga
(little hills) ubutumba
(very big ~) igisozi
(white ant hill) umugina
En-En dictionary 
knolls    ubutumba
En-En dictionary