het·er·oph·o·ny 
(hĕt′ə-rŏfə-nē)
(hĕt′ə-rŏfə-nē)n.
The simultaneous playing or singing of two or more versions of a melody.
het′er·o·phonic (-ər-ə-fŏnĭk) adj.
- sphenogram
- sphenoid
- sphenoidal
- sphenoid bone
- spher-
- spher-
- spheral
- sphere
- sphere of influence
- spheric
- spherical
- spherical aberration
- spherical angle
- spherical coordinate
- spherical excess
- spherical geometry
- spherically
- sphericalness
- spherical polygon
- spherical triangle
- spherical trigonometry
- sphericity
- spherics
- spherics
- spherics