2406. What character can be added to both of these characters to give other characters? 日_ -> _蔵

日  NICHI, JITSU, hi, ka - sun, day

蔵  ZOU, kura - storehouse, warehouse

Add 月:日+月 月+蔵   

月  GETSU, GATSU, tsuki - moon, month

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

臓  ZOU - internal organ