I need to know what is a plural noun

a noun is a naming word such as car
a plural noun is more than one car so it is cars
it can be also as in goose as in one bird or geese as in more than one bird

plu·ral
?plo?or?l/
adjective

1. 1. more than one in number.
   "the meanings of the text are plural"
   

noun GRAMMAR

1. 1. a plural word or form.

the definition of plural

A singular noun is, for example, table or chair.

A plural noun may be scissors, trousers etc.

A noun in the plural form.
Singular (one) dog, plural (many) dogs.
The plural is usually expressed by appending an s to the singular form
One table, two tables
One horse, many horses.
The plural can be expressed in other ways, such as in 0ne man, several men; one shelf, 300 shelves; one wolf, a pack of wolves.

If it ends in (...) 's or just ' (apostrophe). The (...) stands for a plural ending.

singular: incumbent's
plural: incumbents'

Consider a noun such as BOY. When there is only one (a single one) you can say something about the boy, or about a boy.
So you use the form BOY when there is a single one. This form is called the singular form of the noun BOY.
However if you are speaking about or pointing at a group ( of people ) in which everyone is a boy you use the modified form BOYS. This form is called the plural form of the noun BOY. The word plural means many.
The plural of a noun is usually made by adding s to the singular. It is pronounced S after a p, k, or f sound. Otherwise it is pronounced Z.
There are certain exceptions to this rule, the ones that come to my mind are: one child, three children; the man, 10 men; one woman, many women; a single knife, 12 knives; a potato, several potatoes; the top shelf, all the shelves.
Note: When you look for the meaning of a noun in a dictionary, you look for the singular form, although the plural is indicated in full if it is irregular (does not follow the rule).

Consider a noun such as BOY. When there is only one (a single one) you can say something about the boy, or about a boy.
So you use the form BOY when there is a single one. This form is called the singular form of the noun BOY.
However if you are speaking about or pointing at a group ( of people ) in which everyone is a boy you use the modified form BOYS. This form is called the plural form of the noun BOY. The word plural means many.
The plural of a noun is usually made by adding s to the singular. It is pronounced S after a p, k, or f sound. Otherwise it is pronounced Z.
There are certain exceptions to this rule, the ones that come to my mind are: one child, three children; the man, 10 men; one woman, many women; a single knife, 12 knives; a potato, several potatoes; the top shelf, all the shelves.
Note: When you look for the meaning of a noun in a dictionary, you look for the singular form, although the plural is indicated in full if it is irregular (does not follow the rule).

Consider a noun such as BOY. When there is only one (a single one) you can say something about the boy, or about a boy.
So you use the form BOY when there is a single one. This form is called the singular form of the noun BOY.
However if you are speaking about or pointing at a group ( of people ) in which everyone is a boy you use the modified form BOYS. This form is called the plural form of the noun BOY. The word plural means many.
The plural of a noun is usually made by adding s to the singular. It is pronounced S after a p, k, or f sound. Otherwise it is pronounced Z.
There are certain exceptions to this rule, the ones that come to my mind are: one child, three children; the man, 10 men; one woman, many women; a single knife, 12 knives; a potato, several potatoes; the top shelf, all the shelves.
Note: When you look for the meaning of a noun in a dictionary, you look for the singular form, although the plural is indicated in full if it is irregular (does not follow the rule).