Proper Noun vs. Common Noun: Key Differences Explained
A Proper Noun names a unique person, place, or brand (Sarah, Paris, Nike) and is always capitalized. A Common Noun labels any general item (girl, city, shoe) and stays lowercase unless it starts a sentence.
People swap them because spell-check often autocaps words that feel “special,” and marketing loves turning everyday words into brand Proper Nouns—think “Apple” vs. “apple.”
Key Differences
Proper Nouns pinpoint one entity and demand capital letters; Common Nouns describe any member of a group and remain lowercase. If you can replace the word with “it” or “them,” it’s common.
Examples and Daily Life
Write “I bought coffee at Starbucks on Main Street.” Swap “Starbucks” for “a café” and “Main Street” for “a street,” and the sentence still works—showing which nouns are common.
Is “mother” ever a Proper Noun?
Only when used as a name, e.g., “I asked Mother.” Otherwise, “my mother” is common.
Do job titles count as Proper Nouns?
Not unless they directly replace a name: “CEO Smith” is proper; “the CEO” is common.