Proper nouns.
If proper nouns are allowed: Mississippi Missouri
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 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.
Aqualung, Aqua-Lung, and Aqua Lung are registered trademarks (proper nouns) for scuba diving breathing equipment.
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.