Using Capital Letters (Proper Nouns and Common Nouns)
 
Do not use a capital letter for a common noun (i.e., the word for something) unless it starts a sentence. For example:

  • city
  • cat
  • ocean
  • uncle
  • tower
Do use a capital letter for a proper noun (i.e., the specific name of something). For example:

  • New York
  • Lucky
  • Pacific Ocean
  • Uncle George
  • Sears Tower
 

Capital Letters for Proper Nouns

Use capital letters for the names of people, places, planets, days of the week, titles of rank or relationship (when joined to personís name, e.g., Sergeant Smith, Uncle Fred), months, holidays, departments, clubs, companies, institutions, bridges, buildings, monuments, parks, ships, hotels, streets, historical events, and documents. These are known as proper nouns.)

Do not use a capital letter for a common noun, unless it starts a sentence. A common noun is the word we use for something, e.g., dog, ship, auntie. Common nouns contrast with proper nouns, which are specific names or titles, e.g., Rover, Titanic, Auntie Sally.

Examples Showing When to Use Capital Letters

In the examples below, the proper nouns (i.e., the names or titles) are in bold.

  • The next lake the party visited was Lake Michigan.
  • (The word lake is a common noun. It is the word for an in-land water feature.
    Lake Michigan is a proper noun. It is the name of the lake.)

  • According to Lord Davies, The Church in London is not actually a church but a public house.
  • (The Church is a proper noun. The word church is a common noun.)

  • It was a rewarding day, and I intend to visit here again on Armistice Day next year.
  • (The word day is a common noun. Armistice Day is a proper noun.)

  • Could you ask Sergeant Allan or the other sergeant to arrange the patrol on Friday morning?
  • (Sergeant Allan is a proper noun. The word sergeant is a common noun.)

Big Fish should be big fish
(magazine article)


Toilet should be toilet
(instructions on packaging for a toilet seat)
 
COMMON NOUN AND PROPER NOUN?

A common noun is the word for something (e.g., tower).

A proper noun is the name of something (e.g., The Eiffel Tower).

Read more about proper nouns.
Read more about common nouns.
Read more about the different types of nouns.
 
 
STICK TO THE RULES

Do not be tempted to give a word a capital letter just because it is an important word in your sentence.

  • Place your order using the form in our latest Brochure.

  • We value our Clients' opinions.

  • I'm having the best day of my life, and I owe it all to not going to Church! (Homer Simpson)

  • Lisa, Vampires are make-believe, like elves, gremlins, and Eskimos. (Homer Simpson)
  • (Vampires is wrong. Eskimos is correct.)

  • We live in an age when Pizza gets to your home before the Police.
 
 
QUIRKS IN BUSINESS WRITING

In business writing particularly, it is considered good practice (for politeness) to capitalize some common nouns, such as Company and Director – you have a choice.

  • The manager of your company confirmed the booking in writing on 15 August.

  • The Manager of your Company confirmed the booking in writing on 15 August.
In the main, this pertains to job titles and names of departments. Other words which may be important enough in the context of your writing to warrant capital letters are: Director, President, Office Manager, Commanding Officer, Division, Claims Department, Court, Regiment, and Unit.

  • The director will cast the final vote.
  • The Director will cast the final vote.
  • The Director will cast the final Vote.
 

See also:

What are nouns?
The different types of nouns
Capital letters in advertisements
Capital letters and the points of the compass
Capital letters with the four seasons
Capital letters with moons, stars and planets
Capital letters start sentences
What is title case?
Test on using capital letters