Is daughter a common noun or a proper noun?

Answer 1

The noun 'daughter' is a common noun, a general word for any female offspring.

A proper noun is the name or title of a specific person, place, or thing. When someone addresses their female offspring by the title "Daughter', it is then a proper noun.

Answer 2

Daughters is a common noun. If a common noun is part of a name, it becomes a proper noun. Proper nouns are the unique names of people, places, or things. Common nouns are the words for general things. Pronouns always replace proper and common nouns.