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

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

涌出[youshutsu] gushing out
涌き立つ[wakitatsu] to appear suddenly
涌泉[yuusen] bubbling or gushing spring
涌き[waki] welling (up)