Concrete nouns are words that represent actual, tangible things, such as people, objects and places. They are the opposite of abstract nouns, which are things such as emotions and ideas. Concrete nouns can be plural, singular, proper or common.
People as Concrete Nouns
Words identifying a person or group of people are all concrete nouns. These include proper nouns, such as names and nationalities, and common nouns, such as professions. For example, the words "Mary," "doctor," "Americans" and "passengers" are concrete nouns, as they refer to a single person or group of people. All these words can be used as subjects in a sentence, as in: "Many passengers are on the train."
Things as Concrete Nouns
Words and names for inanimate objects, as well as animals, are concrete nouns. As with other types of concrete nouns, they can be plural, singular, common or proper. Some examples are "dog," "desk," the "Bible" and "blueberries." In a sentence, these can act as a subject, for example: "The dog ran after the ball in the park."
Places as Concrete Nouns
Words referring to places, such as proper nouns including names of cities and countries or common nouns referring to general areas or types of places, are all concrete nouns. They can be either plural or singular. For example, "Montreal," "downtown," "Jamaica" and "countryside" are concrete nouns. In a sentence, you may see one of these words used as follows: "Nick and Tiffany went to Jamaica for their honeymoon." Note that this sentence contains four nouns -- "Jamaica" is a concrete noun, as it refers to a place; "Nick" and "Tiffany" are also concrete nouns, as they are people; and "honeymoon" is an abstract noun, since it refers to a concept as opposed to a specific, tangible thing.