1310. What character can be added to both of these characters to give other characters? 敬_ -> _義

Answer:

敬  KEI, uyama(u) - respect, revere

義  GI - justice, honour

Add 言:敬+言 言+義 

言  GEN, GON, i(u), koto - say, speech

警  KEI - admonish, warn

議  GI - deliberation