oxfordshire

As a noun taxonomy

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

As a proper noun oxfordshire is

a midland county of england bordered by buckinghamshire, gloucestershire, berkshire, wiltshire, warwickshire and northamptonshire.

As a proper noun oxfordshire

is a midland county of england bordered by buckinghamshire, gloucestershire, berkshire, wiltshire, warwickshire and northamptonshire.

As a noun oxon is

(organic chemistry) any organic compound derived from another in which a phosphorus-sulfur bond in the parent has been replaced by a phosphorus-oxygen bond in the derivative.