It's not easy to describe a noun. In simple terms, nouns are "things" (and verbs are "actions"). Like food. Food (noun) is something you eat (verb). Or happiness. Happiness (noun) is something you want (verb). Or human being. A human being (noun) is something you are (verb).

What is a Noun?

The simple definition is: a person, place or thing
teacher, school, book

Noun Countability

Countable and uncountable nouns. Why is this important? Why do some nouns have no plural?
dog/dogs, rice, hair(s)

Proper Nouns

Your name is a "proper noun". Do we say "Atlantic Ocean" or "the Atlantic Ocean"? Should I write "february" or "February"?
Shirley, Mr Jeckyll, Thailand, April, Sony

Possessive 's

Adding 's or ' to show possession.
John's car, my parents' house

Noun as Adjective

Sometimes we use a noun to describe another noun. In that case, the first noun is "acting as" an adjective.
love story, tooth-brush, bathroom

Compound Nouns

A compound noun is a noun that is made with two or more words.
tennis shoe, six-pack, bedroom

Noun Phrases