umusokoro (imi-)     2  class 2
singular: umu-
plural: imi-
  
spears on big reeds and grasses
umusokōro (imi-)     2  class 2
singular: umu-
plural: imi-
  
marrow in bone
bone marrow   umusokōro
En-En dictionary 
marrow    (in bone) umusokōro
En-En dictionary 
spear    icumu
(stuck in person) urubāngo
(spears on big reeds and grasses) umusokoro
(to fall on ~ and be injured) gushōka
En-En dictionary