Nouns refer to things—the names of people (Dr. Sanders, lawyers), places (Kansas, factory, home), things (scissors, sheet music, book), or ideas (love, truth, beauty, intelligence). Let’s take a look at each of these types of nouns and how they need to be treated grammatically.
A proper noun refers to a specific person, place, organization, etc. Proper nouns are capitalized because they are specific nouns
The capitalization rule also applies to adjectives that are based on proper nouns: