2959. What character can be added to both of these characters to give other characters? 日_ -> _同

日 NICHI, JITSU, hi, ka - sun, day

同 DOU, TOU, ona(ji) - same

Add 月:日+月 月+同

月 GETSU, GATSU, tsuki - moon, month

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

胴 DOU - torso, trunk