泉下 is read as せんか (senka) and means Hades.
せんか
senka
いずみ
spring
せんすい
fountain
せんせき
springs and rocks
せんしゅう
Quanzhou (China)
せんしつ
hot spring water quality
せんもん
gates of Hades
ていか
fall
でんか
your Highness
れいか
below zero
ひょうてんか
below freezing
けんか
in the prefecture
もんか
one's pupil