No, the nouns quarter, dime, and nickel are common nouns; a word for a quarter of anything; any quarter, dime, or nickel.
A proper noun is the name of a specific person, place, thing, or a title; for example:
The spelling 'nickel' is a common noun, a word for a chemical element (Ni) and a US five cent coin.
The noun 'Nickle' is a proper noun, the name of a person, a surname.
The nouns for American currency are common nouns, general words for banknotes and coins of any kind: dollar, quarter, penny, etc.
A proper noun is the name of a specific person, place, or thing; for example, the Family Dollar Store; the French Quarter, a neighborhood in New Orleans; or Penny Lane, a street in Liverpool UK or a song by The Beatles.
The term 'American history' is a noun phrase, a group of words based on a noun that functions as a unit in a sentence.The noun phrase 'American history' is made up of the common noun 'history' and the proper adjective 'American'.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Common
It is a proper noun, because it is the name of a specific thing.
proper
The term African American is a compound, proper noun, a word for a specific group of people. The plural noun, intellectuals is a common noun. The proper noun African American is a 'noun used as an adjective' to describe the common noun intellectuals. Using a proper adjective or a proper noun to describe a common noun does not change the common noun into a proper noun; for example McDonald's fries, the noun fries is still a common noun; or for Shakespearean character, the noun character is still a common noun.
American is a proper noun. It can also be an adjective, as in "American cheese." A rule of thumb: proper nouns are capitalized and common nouns are not capitalized.
American Pie is a proper noun. Proper nouns are the unique names of people, places, or things. Common nouns are the words for general things. If a common noun is part of a name, it becomes a proper noun. Pronouns always replace proper and common nouns.
The term 'American history' is a noun phrase, a group of words based on a noun that functions as a unit in a sentence.The noun phrase 'American history' is made up of the common noun 'history' and the proper adjective 'American'.
"Mexican American" is a proper noun when referring to a specific individual or group of individuals of Mexican descent living in the United States. When used in a general sense to describe a person of Mexican descent living in the U.S., it can be considered a common noun.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
"American Red Cross" is a proper noun because it is the name of a specific organization.
American Idol is the name of a show so it is a proper noun.
Common
A proper noun is the name of a specific person, place, or thing. A common noun is a word for any person, place, or thing. EXAMPLES common noun, apple; proper noun, Fiona Apple (American actress) common noun, park; proper noun, Central Park (New York City) common noun, cookie; proper noun, Oreo
It is a proper noun, because it is the name of a specific thing.
proper