Common Noun

Any word which bears the name of any generic term or non-specific categories is are Common Noun. The first letters are generally not capitalised and are used with Articles or Determiners. These words refer to a broad category and do not have a specific significance, unlike Proper Nouns.

Yes, apart from Proper Noun, all other forms of Nouns, including Collective Noun, Concrete Noun, Abstract Noun, Countable Noun, etc. can be Common Nouns. As long as they do not refer to anything specific, all these types of Nouns can be considered Common Noun.

As opposed to the Common Nouns, Proper Noun refers to someone, some place or something specific. The Proper Noun has to be written in a capital letter, irrespective of whether the sentence starts with that or not. On the other hand, Common Nouns are generic terms and do not need to be written in capital letters, unless it is placed at the beginning of the sentence. For example:

Siya is the topper in her class.

Here, Siya is the Proper Noun, and topper and class are Common Nouns.

Common Noun is one of the nine types of Nouns, which denotes the name of a group or a type of existing phenomenon. Like the name suggests, Common Nouns refer to any living or non-living beings, places, or abstract ideas or thoughts. As long as a word is not named anything specific, it is considered to be a Common Noun.