深淵[shinen] abyss
淵源[engen] origin
淵叢[ensou] gathering spot

海淵[kaien] ocean depths
深淵に臨むが如し[shinenninozomugagotoshi] like looking out on an abyss
淵酔[ensui] type of imperial banquet held during the Heian period and later

汚染源[osengen] source of pollution
音源[ongen] sound source
禍源[kagen] source of misfortune
供給源[kyoukyuugen] source of supply
経営資源[keieishigen] management resource

源氏物語[genjimonogatari] the Tale of the Genji
源泉[gensen] source
源流[genryuu] current-limiting
語源[gogen] word root