光沢【こうたく】
brilliance, polish, lustre, luster, glossy finish (of photographs)
贅沢【ぜいたく】
luxury, extravagance, to live in luxury, to indulge oneself, lavish (use of something), abundant, copious, wasteful, excessive (e.g. demands, expectations)
沢山【たくさん】
a lot, lots, plenty, many, a large number, much, a great deal, a good deal, enough, sufficient, enough, too many, too much
沼沢【しょうたく】
marsh, swamp, bog