利用 WordNet 数据库，查找给定单词的所有近义词和反义词。

单词：happy
近义词：joyful, delighted, pleased, content, glad, cheerful, elated, ecstatic, euphoric

反义词：sad, unhappy, miserable, sorrowful, depressed, gloomy, sullen, dejected, melancholy, despondent