1977. What character can be added to both of these characters to give other characters? 日_ -> _民

日  NICHI, JITSU, hi, ka - sun, day

民  MIN, tami - people, nation

Add 目:日+目 目+民  

目  MOKU, me - eye

冒  BOU , oka(su) - risk, brave, deft, dare, desecrate

眠  MIN, nemu(ru), nemu(i) - sleep. sleepy, tired