Noun

A common noun is a name for something which is common for many things, person, or places. It encompasses a particular type of things, person, or places.

Example: Country (it can refer to any country, nothing in particular), city (it can refer to any city like Melbourne, Mumbai, Toronto, etc. but nothing in particular).

So, a common noun is a word that indicates a person, place, thing, etc. In general and a proper noun is a specific one of those.

A proper noun is a specific (i.e., not generic) name for a particular person, place, or thing. Proper nouns are always capitalized in English, no matter where they fall in a sentence. Because they endow nouns with a specific name, they are also sometimes called proper names.

A concrete noun  refers to the things we see and have physical existence.

Example: Chair, table, bat, ball, water, money, sugar, etc.

An abstract noun is a word for something that cannot be seen but is there. It has no physical existence. Generally, it refers to ideas, qualities, and conditions.

Example: Truth, lies, happiness, sorrow, time, friendship, humor, patriotism, etc

The nouns that can be counted are called countable nouns. Countable nouns can take an article: a, an, the.

Example: Chair, table, bat, ball, etc. (you can say 1 chair, 2 chairs, 3 chairs – so chairs are countable)

A collective noun is a word for a group of things, people, or animals, etc.

Example: family, team, jury, cattle, etc.

Collective nouns can be both plural and singular.