Nouns are the building blocks of sentences. They are naming words. Every time you talk about a person, a place, a thing, or even an idea, you are using a noun.

Let's break it down into four simple categories. A noun can be a:

• Person: teacher, doctor, Maria, Tom
• Place: city, school, park, London
• Thing: book, car, tree, phone
• Idea: love, freedom, happiness, courage

Notice how the first two examples in each list are general, while the last two are very specific. That difference is key, and it leads us to the two main types of nouns.

All nouns fit into one of two main groups: common or proper. The distinction is all about specificity.

A common noun is the generic name for an item in a class or group. Words like dog, river, and friend are common nouns. They don't refer to a particular dog or river. Because they are general, you only capitalize them if they begin a sentence.

In that example, boy, ball, and park are all common nouns. We don't know which specific boy, ball, or park is being discussed.

Proper nouns, on the other hand, are much more specific.

Think of a proper noun as a unique name. Fido, the Nile, and John are proper nouns. They refer to a specific dog, a particular river, and an individual person. The most important rule for proper nouns is that they are always capitalized, no matter where they appear in a sentence.

Here, David and Central Park are capitalized because they are specific names. This capitalization rule is a signal to the reader that we're talking about something unique.

Let's review the main ideas before you test your knowledge.

Ready to see how well you understand nouns?

Great work. Understanding the difference between common and proper nouns is a simple but powerful step toward becoming a more confident writer and reader.