The difference between Quad and Quin

Quad as a noun:

Four shots of espresso.

Quad as a noun (chess):

A kind of round robin tournament between four players, where each participant plays every other participant once.

Quad as a noun (Mormonism):

The Bible, Book of Mormon, Doctrine and Covenants, and Pearl of Great Price bound in a single volume.

Quad as a noun:

A poster, measuring forty by thirty inches, advertising a cinematic film release.

Quad as an adjective:

Having four shots of espresso.

Quad as a noun (informal):

A quadrangle .

Quad as a noun (informal):

A quadruplet .

Quad as a noun (computer graphics):

A quadrilateral.

Quad as a noun (informal):

A quadriceps muscle.

Quad as a noun (informal):

A quadrupel beer.

Quad as an adjective (poker slang):

Of or relating to quads.

Quad as a noun:

A quad bike

Quad as a noun:

Quad as a noun (metal type):

A blank metal block used to fill short lines of type.

Quad as a noun (printing, _, slang):

A joke used to fill long days of setting type.

Quad as a noun (typography, phototypesetting and digital typesetting):

A keyboard command which aligns text with the left or right margin, or centred between them. In combination, as quad left, quad right or quad centre.

Quad as a verb (metal type, transitive, intransitive):

To fill spaces in a line of type with quads. Also quad out.

Quad as a verb (typography, phototypesetting and digital typesetting, transitive, intransitive):

To align text with the left or right margin, or centre it.

Quin as a noun (informal):

A quintuplet.

Quin as a noun:

A European scallop, Pecten opercularis, used as food.