1005. What character can be added to both of these characters to give other characters? 言_ -> _頁

Answer:

言  GEN, GON, i(u), koto - say, speech

頁  KETSU, peeji - page

Add 丁:言+丁 丁+頁 

丁  CHOU, TEI - counter, block

訂  TEI - correcting

頂  CHOU, itadaki, itada(ku) - top, peak, summit, receive