ghost    umuzimu, igikānge
En-En dictionary 
igihūme (ibi-)     4  class 4
singular: iki-,ic-
plural: ibi-,ivy-
  
spirit, superhuman thing, a one-armed and one-legged ghost with grass growing out of its ears that lives in the valley (used as a serious insult)
igikānge (ibi-)     4  class 4
singular: iki-,ic-
plural: ibi-,ivy-
  
ghost (thing which resembles person but has supernatural powers)
umuzimu (imi-  2  class 2
singular: umu-
plural: imi-
  
spirit, ghost