1565. What character can be added to both of these characters to give other characters? 日_ -> _宛

Answer:

日  NICHI, JITSU, hi, ka - sun, day

宛  ON, EN, ate(ru) - allocate

Add 月:日+月 月+宛 

月  GETSU, GATSU, tsuki - moon, month

明  MEI, MYOU, aka(rui), a(keru) - bright

腕  WAN, ude - arm, ability, talent, skill