What is NOUN?

The part of speech (or word class) that is used to name or identify a person, place, thing, quality, or action. The simple definition is: a person, place or thing.

Most nouns have both a singular and plural form. Nouns can also be preceded by an article and/or one or more adjectives.

Singular Nouns

The singular form is used when considering the noun as a single item (count) or entity (non-count).

brick, dog, airplane, person, foot, water, sugar, truth

Plural Nouns

The plural form is used when considering more than one of the same item. Non-count nouns do not have a plural form.

bricks, dogs, airplanes, people, feet, 

Regular plurals
Most plurals are formed by adding -s or -es to the singular noun:

bricks (brick), dogs (dog), airplanes (airplane), cars (car), pens(pen)

In some cases, there are special spelling rules that need to be considered when forming the plural.

knives (knife), hobbies (hobby), quizzes (quiz)

Irregular plurals
Some nouns take on a different form in the plural:

women (woman), teeth (tooth), mice (mouse), children (child)



(Adapted from: http://grammar.about.com/od/mo/g/nounterm.htm; http://www.eslgold.com/grammar/singular_plural.html)