泥洹 is read as ないおん (naion) and means nirvana.
ないおん
naion
どろぼう
theft
すくも
peat
どろぬま
quandary
どろ
thief
どろどろ
muddy
でいすい
muddy water
being dead drunk
どろじあい
mudslinging contest
どろみずかぎょう
making a living in the red-light district
どろだんご
ball of mud
どろにんぎょう
clay doll
どろぼうせいじか
kleptocrat