It can be common or proper. A collective noun is a word that implies a group or collection of persons, places, things, or ideas. It can be common or proper. A possessive noun designates ownership by adding 's to the noun. A plural noun adds s without the apostrophe.
Spelling rules vary.
An appositive is a group of words that explains the noun it follows. The noun it takes the place of is called its antecedent. The pronoun can take the place of one or more nouns. Subject pronouns are used as the subject of a sentence to replace the subject noun. Object pronouns are used in the predicate to replace the noun that receives the action of the verb.