Is a policeman a common or proper noun?

Answer 1

The noun 'uniform' is a common noun, a word for any uniform.

A proper noun is the name of a person, place, thing, or a title; for example:

• 'A Man In Uniform' by Kate Taylor
• Uniform Street, Hinckley, MN
• Uniform Village of Rochester, NY
• Uniform Commercial Code (UCC), US commerce regulations

Answer 2

The noun 'policeman' is a common noun, a general word for a male law enforcement officer; a word for any policeman anywhere.

A proper noun is the name or title of a specific person, place, or thing; for example, Policeman Club Road in Falling Waters WV or "The Policeman's Handbook of Law" published by the Police and Sheriffs Association of North America.

A proper noun is always capitalized.