2369. Read that back to me! What do these characters have in common? 医 然 暴 獲 壱

They all have a reading that is the same backwards.  

医  I - medicine, healing

然  ZEN, NEN - like, as 

暴  BOU, BAKU, aba(reru), aba(ku) - rage, rampage, expose

獲  KAKU, e(ru) - obtain, acquire, gain

壱  ICHI - one