'Mother' is a :

Nouns are words that identify a specific person, animal, location, item, or concept. All nouns can be divided into Proper and Common nouns. Common nouns are words used to refer to general objects rather than particular ones. To distinguish between them—we can state that a Common noun is a general way of defining something and a Proper noun is a specific way of classifying something. Thus, 'mother' is a Common noun in this context.