Noun, Nouns, Definition of Noun, What is Noun

Nouns, Noun and its Kinds
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 are Nouns?
The simple definition is: a person, place or thing
teacher, Khalid, Karachi, school, book, Football
You have probably learnt the rhyme, "A noun is the name of a person, place or thing." This is quite helpful to a point, but as you know by now there are different kinds of noun!
Countable Nouns, Uncountable Nouns
Why is this important? Why do some nouns have no plural?
dog/dogs, rice, hair(s)
Types of Nouns:
Common nouns are the names of things in general, such as cat, dog, road, city, skirt, colour etc.
A proper noun is the name of a particular person, place or thing, such as Khalid, Shaheen, Karachi, River Indus etc. All proper nouns start with a capital letter.
A collective noun is the name given to a group of things, for example a flock of birds or a herd of cows.
An abstract noun is something you can't see, hear, touch or taste. These can be emotions (happiness, grief) or states (peace, quiet) for example.
Proper Nouns (Names)
Do we say "River Indus" or "the River Indus"? Should I write "march" or "March"?
Shaheen, Khalid, China, April, Sonia
Possessive 's
Adding 's or ' to show possession.
Khali'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.