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

Answer:

日  NICHI, JITSU, hi, ka - sun, day

市  SHI, ichi - city, market

Add 月:日+月 月+市 

月  GETSU, GATSU, tsuki - moon, month

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

肺  HAI - lung