A noun!
Actually, that is true most of the time. Technically, it could be a noun -- or it could be an adjective.
Direct objects answer the questions "What?" or "Whom?" relative to an action verb. Predicate adjectives or predicate nominatives (nouns) answer the questions "What?" or "Whom?" about a linking verb.
Take for example the sentences below:
George threw the ball.
What did George throw? The ball. Ball is the direct object.
George is a teacher.
Whom is George? A teacher. Teacher is a predicate nominative (noun) because it renames George and answers the question "whom?"
George is skillful.
What is George? Skillful. Skillful is a predicate adjective because it describes George and answers the question "what?"
"Answers what" refers to providing information or clarification about a topic or question, while "answers whom" refers to identifying the person or entity that is the subject of a question.
The subject of a sentence answers the question "what" or "whom." It refers to the person or thing that is performing the action or being described in the sentence.
The subject receives the action of the verb. The dog chased the cat. what was chased = the cat.
What is used for things. Whom is used for a person.
The part of speech that answers "what" or "whom" in a sentence is a pronoun. Pronouns are words like "he," "she," "it," "they," "who," and "what" that replace nouns in a sentence.
"Answers what" refers to providing information or clarification about a topic or question, while "answers whom" refers to identifying the person or entity that is the subject of a question.
The subject of a sentence answers the question "what" or "whom." It refers to the person or thing that is performing the action or being described in the sentence.
In terms of sentence construction it is called the 'subject'.
The answer to "what" is a thing.The answer to "whom" is a person.The pronoun "whom" functions as the object of a verb or a preposition.The corresponding pronoun "who" functions as the subject of sentence or a clause.The pronoun "what" functions as a subject or an object in a sentence.
The subject receives the action of the verb. The dog chased the cat. what was chased = the cat.
Give the letter to Mary. to whom?The letter is for Mary. for whom?
What is used for things. Whom is used for a person.
In English grammar, "what" is used to ask about things or ideas, while "whom" is used to ask about people or objects that are the object of a verb or preposition. "What" is used for subjects and direct objects, while "whom" is used for indirect objects and objects of prepositions. For example, "What are you reading?" asks about the thing being read, while "Whom did you give the book to?" asks about the person receiving the book.
A noun that answers the question "To Whom?" ot "To What?" or "For Whom?" or "For What?"
Proper nouns
The part of speech that answers "what" or "whom" in a sentence is a pronoun. Pronouns are words like "he," "she," "it," "they," "who," and "what" that replace nouns in a sentence.
E. Norman Ellis has written: 'Evaluation of the involvement of a police officer in schools of the Killarney District' -- subject(s): Police-community relations, Schools 'Survey of pupils in Vancouver schools for whom English is a second language' -- subject(s): Children of immigrants, Education, English language, Foreign speakers, Language arts, Minorities, Study and teaching 'Survey of achievement in reading in grade 5 of Vancouver schools, February 17-21, 1975' -- subject(s): Ability testing, Reading, Reading (Elementary)