Text & writing
Proper Nouns vs. Common Nouns: What to Capitalize
Most capitalization decisions come down to one question: is this word the name of a specific person, place, organization, or thing — a proper noun — or a general word — a common noun? This guide explains the difference with the cases people most often get wrong, such as job titles, seasons, and compass directions.
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The basic rule
Proper nouns name one particular thing and are capitalized wherever they appear: Paris, Maria, the Red Cross, Microsoft, Monday, July. Common nouns name a general kind of thing and are lowercase unless they start a sentence: city, woman, charity, company.
The same word can be either. “The river flooded” uses a common noun; “the Thames flooded” names a specific river.
Cases that trip people up
These are common conventions in American style guides; individual guides differ on details, so follow the one your publication uses.
| Situation | Usually capitalized | Usually lowercase |
|---|---|---|
| Job titles | Before a name: President Lincoln, Doctor Patel | Used generally: the president, a doctor |
| Seasons | Only when part of a name: Summer Olympics | spring, summer, fall, winter |
| Directions | Named regions: the South, the Middle East | Directions: drive south, the north side |
| Family words | Used as a name: Ask Mom | With a possessive: ask my mom |
| Days and months | Monday, March | — |
| Brands | Brand and product names: Google, Kleenex | Generic words: search, tissue |
Why tools cannot always tell
Whether a word is a proper noun often depends on meaning, not spelling: “apple” the fruit and “Apple” the company, “turkey” the bird and “Turkey” the country. Automatic sentence case tools lowercase everything except the first word of each sentence, so they cannot restore these capitals. Keep a short list of the names in your text and check them after converting.
Proper vs. Common Nouns FAQ
- What is a proper noun?
- A name for one specific person, place, organization, or thing, such as Paris, Maria, or the Red Cross. Proper nouns are always capitalized.
- Is “president” capitalized?
- Usually only as a title directly before a name (President Lincoln). Used generally, “the president” is lowercase in most American styles.
- Are seasons capitalized?
- No, unless they are part of a name such as the Summer Olympics.
- Are compass directions capitalized?
- Directions are lowercase (head north); named regions are capitalized (the North, the Midwest).
- Why can’t sentence case tools capitalize names?
- Because many names are spelled like ordinary words. Without understanding the meaning, a tool cannot tell “apple” from “Apple”.
Related guides
- Capitalization After Colons and QuotesWhen to capitalize the first word after a colon, inside quotation marks, and in parentheses — including how APA and Chicago’s 17th and 18th editions differ.
- Fixing Text Typed in All CapsWhere all-caps text comes from, which capitalization to convert it to, what a converter cannot recover, and a safe workflow for restoring names and acronyms.
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