2269. Read that back to me! What do these characters have in common? 市 浅 宇 飢 粘

They all have a reading that is the same backwards.  

市  SHI, ichi - city, market

浅  SEN, asa(i) - shallow

宇  U - heaven

飢  KI, u(eru) - starve

粘  NEN, neba(ru) - be sticky, persevere