Friday is a proper noun, not a common noun.Nouns refer to people, places, and things. Nouns can be dividedinto proper nouns and common nouns. Proper nouns are names forspecific people, places, events, and things, such as ProfessorPurple, Dublin, and the Kentucky Derby, and are capitalized. Commonnouns are nouns that refer to types of people, places, and things,such as postman, anaconda, radio, driveway, millennium, andliberty, and are not capitalized except at the beginning of asentence. Friday is a proper noun because it refers to a specificday of the week.