井泉[seisen] (water) well
黄泉[kousen] underground spring
温泉[onsen] spa
九泉[kyuusen] hades
源泉[gensen] source

古泉学[kosengaku] numismatics
鉱泉[kousen] mineral spring
泉貨紙[senkashi] reclaimed paper
泉水[sensui] fountain

亜温帯[aontai] subtemperate zone
異常高温[ijoukouon] abnormally high temperatures
一定温度[itteiondo] constant temperature
引火温度[inkaondo] flash temperature
微温い[nurui] lukewarm

温み[nukumi] warmth
温む[nurumu] to become lukewarm
温もり[nukumori] warmth
温雅[onga] graceful
温海[atsumi] warm sea