ubusore     8  class 8
singular: ubu-
  
(no pl.) youth
youth    (age group) ubusore
(young man) umusore
(youth) intōre
(youth mob) imisore
(group of) urwaruka
En-En dictionary 
 ubusore found in: Kirundi I (Study lessons)
lesson 28   Class 8 ubu–, ama– (continued)