A noun is a person, place, thing, or sometimes an idea.

A proper noun is a specific name for a particular person, place, or organization, and it is always capitalized.

A common noun is a general name for a person, place, or thing and is not capitalized.

Kuala Lumpur is an example of a proper noun.

The common nouns are 'dog' and 'eyes'.

Wednesday is the proper noun in the sentence.

A common noun refers to a general item or concept, while a proper noun refers to a specific item or concept.