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

湧き出す[wakidasu] to gush out
湧き上る[wakiagaru] to boil up
湧き起る[wakiokoru] to well up
湧き出る[wakideru] to gush forth
湧く[waku] to well (up)

降って湧く[futtewaku] to happen suddenly
湧出[yuushutsu] gushing out
湧き水[wakimizu] spring water
湧出量[yuushutsuryou] output
湧水[yuusui] spring