What are Nouns?
A noun is a naming word.

Nouns have gender, number and case.

1) Common noun - is a word used to name any person, animal, thing or place belonging to a certain category:
sailor, girl, city, dog

2) Proper noun - is a name of particular person, animal, place or thing. It always begins with a capital letter:
Brisbane, Colorado, Andrea, Telstra

3) Collective noun - is the name given to a number of persons or things considered as a group:
class, mob, audience, herd

4) Abstract noun - is a word used to name a quality or feelings:
happiness, luck, fear, hope


Number

Nouns may be either singular or plural.
a) A singular noun is a name of one person, animal, place or thing:
table, captain. Alex, sadness

b) A plural noun is a name of more than one person, thing, place or thing:
tables, captains, laws, keys


Gender

A noun may be masculine, feminine, neuter or common (either masculine or feminine).
a) masculine - referring to male creatures: boy, man, son, king
b) feminine - referring to feminine creatures: girl, daughter, hen, ewe
c) neuter - referring to things that have no sex: mountain, river, bike, computer
d) common - referring to either sex: teacher, friend, kitten, child