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

悪税[akuzei] irrational tax
印税[inzei] royalty (on book)
仮納税[karinouzei] tax payment under protest
加工税[kakouzei] processing tax
苛税[kazei] heavy taxation

課税[kazei] taxation
課税控除[kazeikoujo] tax exemption
課税所得[kazeishotoku] taxable income
間接税[kansetsuzei] indirect tax
関税[kanzei] tariff (import tax)