Spherical rhymes with:
hysterical, mericle, asymmetrical, categorical, cylindrical, electrical, empirical, geometrical, historical, hysterical, lyrical, maricle, mericle, metaphorical, metrical, morrical, nonelectrical, obstetrical, rhetorical, semicylindrical, symmetrical, theatrical
Spherical sounds like:
sparkle, sparkly, sparsely, supercool