The word ‘Mom’ can be both a common noun and a proper noun, depending on how it is used in a sentence.
When ‘Mom’ is used as a general term to refer to any mother, it is a common noun. For example, in the sentence, ‘Every mom loves her child,’ ‘mom’ is a common noun because it refers to mothers in general.
However, when ‘Mom’ is used as a specific name or title for a particular person, it becomes a proper noun. For example, in the sentence, ‘I told Mom about my day,’ ‘Mom’ is a proper noun because it is used as a name for a specific person.
In summary, ‘Mom’ is a common noun when it refers to mothers in general and a proper noun when it is used as a name for a specific person.