The best replacement for tetrahedral is square planar.

The best alternatives to tetrahedral are rated as following:
★★★★★  square planar
★★★★  octahedral
★★★★  trigonal planar
★★★  trigonal pyramidal
★★  hexahedral mesh
★  pyramidal
★  tetrahedron
★  tetragonal
★  planar
  tetravalent
  trigonal pyramid
  trigonal bipyramidal

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No companions for tetrahedral have been suggested so far.
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tetrahedral
square planar
octahedral