Question:

Like afterlife, blood, tranquility and other dark words that sound nice or has a nice tone when pronounced in Japanese. Thanks! :)

Answer:

紅 (Kurenai) ＝　Red
暗闇 (Kurayami) = Darkness
死後の世界 (Shigo no sekai) = Afterlife
黒 (Kuro) = Black
吸血鬼 (Kyuuketsuki) = Vampire
悲しみ (Kanashimi) = Greif