A proper noun is the noun that is the name of a specific person, place, or thing. In English, they are normally always capitalized.
- "man" is not a proper noun, but "Philo Drummond" is.
- "town" is not proper, but "Jonestown" is.
- "sword" is non-proper, but "Excalibur" is proper.
- The only real god is God*.