What does 天国 mean?
天国 is a Japanese noun meaning “paradise, heaven, Kingdom of Heaven” in English. It is written as 天国 in kanji, てんごく in hiragana, and tengoku in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
結婚生活は夫婦仲が良ければ天国であり、夫婦仲が悪ければこの世の地獄である。
Marriage, in peace, is this world's paradise, in strife, this life's purgatory.