There are two types of nouns. Proper nouns refer to specific persons, places, or things, and they begin with a capital letter. The others are called common nouns, and the only time they are capitalized is if they are an important title or if they occur at the beginning of a sentence:
Common Nouns | Proper Nouns |
boy | John |
Pope | Pope Francis |
planet | Mars |
brand | Lego |
President | Nixon |
state | Florida |
race | Daytona 500 |