capital    (money) umutahe
(city) umurwa mukuru
En-En dictionary 
igisagara (ibi-)     4  class 4
singular: iki-,ic-
plural: ibi-,ivy-
  
big city, capital
Bujumbura     8  class 8
singular: ubu-
  
largest city and former capital of Burundi, originally called Usumbura, it was renamed to Bujumbura at independence, mainly for the negative meaning of Usumbura in Swahili