優婉[yuuen] elegant
婉曲[enkyoku] euphemistic
婉美[enbi] beauty
婉曲迂遠[enkyokuuen] being euphemistic and circumlocutory
婉然[enzen] graceful

婉曲表現[enkyokuhyougen] euphemism
婉曲法[enkyokuhou] euphemism
柔婉[juuen] simple
幽婉[yuuen] modest and beautiful

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