1117. What character can be added to both of these characters to give other characters? 言_ -> _心

Answer:

言  GEN, GON, i(u), koto - say, speech

⺙  The "Bokuzukuri" radical - activity, to strike, hit

Add 方:言+方 方+⺙ 

方  HOU, kata - direction

訪  HOU, tazu(neru), otozu(reru) - visit

放  HOU, hana(reru), hana(tsu), hana(su) - to let loose, release, emit