derby

As a noun taxonomy

is the science or the technique used to make a classification.

As a proper noun derby is

a city in the east midlands of england, once the county town of derbyshire.

Darby is a synonym of derby.

As nouns the difference between derby and darby

is that derby is any of several annual horseraces while darby is a specialized tool used to finish concrete slabs. A stiff, wooden or metal wedge or triangle, it is used to smooth and level the surface of wet concrete.

As proper nouns the difference between derby and darby

is that derby is a city in the east Midlands of England, once the county town of Derbyshire while Darby is {{surname|habitational|from=Old English}.