elliptization

As an adjective spherical

is (label) shaped like a sphere.

As a noun elliptization is

(mathematics) transformation into a spherical.

In mathematics terms the difference between transformation and elliptization

is that transformation is the replacement of the variables in an algebraic expression by their values in terms of another set of variables; a mapping of one space onto another or onto itself; a function that changes the position or direction of the axes of a coordinate system while elliptization is transformation into a spherical 3-manifold.

As nouns the difference between transformation and elliptization

is that transformation is the act of transforming or the state of being transformed while elliptization is transformation into a spherical 3-manifold.