Nominative Case:
* Refers to the grammatical function of a noun or pronoun.
* Indicates that the noun or pronoun is the subject of the verb.
* Example: She is a doctor. (She is in the nominative case because it's the subject)
Predicate Noun:
* A specific type of noun that follows a linking verb (like "is," "are," "was," "were," "seems," "becomes").
* Renames or redefines the subject.
* Example: She is a doctor. (Doctor is the predicate noun because it renames the subject "She")
Key Difference:
While all predicate nouns are in the nominative case, not all nominative case nouns are predicate nouns.
Here's an analogy:
Think of a family. All children are part of the family, but not all family members are children. Similarly, all predicate nouns are in the nominative case, but not all nominative case nouns are predicate nouns.
In summary:
* Nominative Case is a broader grammatical concept that describes the function of a noun or pronoun as the subject.
* Predicate Noun is a specific type of noun that renames the subject and is always in the nominative case.