嬉嬉[kiki] gleeful
嬉しい[ureshii] happy
嬉しがる[ureshigaru] to be glad
嬉し涙[ureshinamida] happy tears
嬉笑[kishou] happy laughter

嬉しそう[ureshisou] delightful
嬉戯[kigi] frisking
嬉泣[ureshinaki] weeping for joy
嬉しがらせ[ureshigarase] flattery
嬉遊曲[kiyuukyoku] divertimento

カバー曲[kabaakyoku] remake of another artist's song (a "cover")
サイン曲線[sainkyokusen] sinusoid
愛唱曲[aishoukyoku] favourite song
委曲[ikyoku] details
一曲[ikkyoku] tune (melody, piece of music)

迂曲[ukyoku] meander
円曲[enkyoku] roundabout way (of speaking or working)
円錐曲線[ensuikyokusen] conic curve
円舞曲[enbukyoku] waltz (composition)
演曲[enkyoku] musical program

シーソー遊び[shiisooasobi] seesaw (game)
悪遊び[waruasobi] prank
園遊会[enyuukai] garden party
宴遊[enyuu] drinking party hall
火遊び[hiasobi] playing with fire

回遊[kaiyuu] excursion
外遊[gaiyuu] foreign travel
旧遊の地[kyuuyuunochi] familiar haunts
吟遊詩人[ginyuushijin] troubadour
空中浮遊[kuuchuufuyuu] levitation