boiling    ububire
(of water in sense of bubbling) agaseba
En-En dictionary 
ububire     8  class 8
singular: ubu-
  
(no pl.) boiling
agaseba (udu-)     7  class 7
singular: aka-,aga-
plural: utu-,udu-
  
1. bubbling of water in spring, or boiling, 2. sifter to sift out chaff