rollerball

As nouns the difference between ballpoint and rollerball

is that ballpoint is (colloquial) a ballpoint pen, biro while rollerball is a kind of ballpoint pen with a spherical nib that uses water-based liquid or gelled ink.

As nouns the difference between taxonomy and rollerball

is that taxonomy is the science or the technique used to make a classification while rollerball is a kind of ballpoint pen with a spherical nib that uses water-based liquid or gelled ink.

In computing terms the difference between trackball and rollerball

is that trackball is a pointing device consisting of a ball housed in a socket while rollerball is a trackball.

As nouns the difference between ink and rollerball

is that ink is a pigment (or dye)-based fluid used for writing, printing etc while rollerball is a kind of ballpoint pen with a spherical nib that uses water-based liquid or gelled ink.

As a verb ink

is to apply to; to cover or smear with ink.

As nouns the difference between nib and rollerball

is that nib is the tip of a pen or tool that touches the surface, transferring ink to paper while rollerball is a kind of ballpoint pen with a spherical nib that uses water-based liquid or gelled ink.

As an adjective spherical

is (label) shaped like a sphere.

As a noun rollerball is

a kind of ballpoint pen with a spherical nib that uses water-based liquid or gelled ink.