2447. What character can be added to both of these characters to give other characters? 敬_ -> _売

敬  KEI, uyama(u) - respect, revere

売  BAI, u(ru) - sell

Add 言:敬+言 言+売   

言  GEN, GON, i(u), koto - say, speech

警  KEI - admonish, warn

読  DOKU, yo(mu) - read