The difference between Mouse and Trackball

Mouse as a noun:

Any small rodent of the genus Mus.

Mouse as a noun (informal):

A member of the many small rodent and marsupial species resembling such a rodent.

Mouse as a noun:

A quiet or shy person.

Mouse as a noun (computing):

(plural mice or, rarely, mouses) An input device that is moved over a pad or other flat surface to produce a corresponding movement of a pointer on a graphical display.

Mouse as a noun (boxing):

Hematoma.

Mouse as a noun (nautical):

A turn or lashing of spun yarn or small stuff, or a metallic clasp or fastening, uniting the point and shank of a hook to prevent its unhooking or straightening out.

Mouse as a noun (obsolete):

Mouse as a noun:

A match used in firing guns or blasting.

Mouse as a noun (set theory):

A small model of (a fragment of) with desirable properties (depending on the context).

Mouse as a noun (historical):

A small cushion for a woman's hair.

Mouse as a verb (intransitive):

To move cautiously or furtively, in the manner of a mouse (the rodent) (frequently used in the phrasal verb to mouse around).

Mouse as a verb (intransitive):

To hunt or catch mice (the rodents), usually of cats.

Mouse as a verb (transitive, nautical):

To close the mouth of a hook by a careful binding of marline or wire.

Mouse as a verb (intransitive, computing):

To navigate by means of a computer mouse.

Mouse as a verb (obsolete, nonce, transitive):

To tear, as a cat devours a mouse.

Trackball as a noun (computing):

A pointing device consisting of a ball housed in a socket