No.
"The red roses in that yard are beautiful."The nouns are roses and yard.
Examples of proper nouns for the common noun 'war' are "War and Peace" by Leo Tolstoy, the 1989 movie "War of the Roses", World War II, or the Revolutionary War.
In the question above, nouns and sentence are the only nouns. Neither of which are proper nouns.
Plural nouns are not capitalized, unless they are proper nouns.
proper nouns = Helen, Romecommon nouns = table, computer
There are no proper nouns in the sentence.
The common noun is person; the proper nouns are Spaniard and Spain.
The plural nouns are adults and roses.
The common nouns are: capital and state.The proper nouns are: Texas and Austin.
Proper nouns are the unique names of people, places, or things. Common nouns are the words for general things. Pronouns always replace proper and common nouns.
None of them are proper nouns. They are all common nouns that refer to colors.
Two kinds of nouns are common or proper, singular or plural.