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

出臍[debeso] protruding navel
膃肭臍[ottosei] fur seal (esp. the northern fur seal, Callorhinus ursinus)
お臍[oheso] navel
臍のゴマ[hesonogoma] belly-button lint
臍の緒[hesonoo] umbilical cord

臍下[seika] lower abdomen
臍下丹田[seikatanden] pit of the stomach
臍曲り[hesomagari] perverseness
臍繰り[hesokuri] secret savings
臍繰り金[hesokurigane] secret savings