different between ballpoint vs rollerball

English

ball +? point

ballpoint (plural ballpoints)

(colloquial) A ballpoint pen.
Have you seen my ballpoint? I need to sign this form, and a felt-tip won't make carbons.
(sewing) A kind of needle with a rounded tip.

roller +? ball

rollerball (plural rollerballs)

A kind of ballpoint pen with a spherical nib that uses water-based liquid or gelled ink.
(computing) A trackball.

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