The compound noun 'prime minister' is a common noun; a Word for any prime minister anywhere; for example:
- As well as being head of government, a prime minister may have other roles.
A proper noun the title or name of a specific person, place, or thing.; for example:
- Stephen Foster, Prime Minister of Canada
- Office of the Prime Minister of Malaysia
- Prime Minister Street, Memphis, TN or Prime Minister Drive, Middle Ridge, QLD Australia
- Prime Minister Restaurant and Catering, Thiensville, WI