2738. What character can be added to both of these characters to give other characters? 矢_ -> _鳥

矢  SHI, ya - arrow

鳥  CHOU, tori - bird 

Add 口:矢+口 口+鳥   

口  KOU, kuchi - mouth

知  CHI, shi(ru) - know

鳴  MEI, na(ku), na(ru)(rasu) - cry, sing, howl, ring