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.
an indirect object
Give the letter to Mary. to whom?The letter is for Mary. for whom?
A direct object does answer what or whom.
What is used for things. Whom is used for a person.
A noun that answers the question "To Whom?" ot "To What?" or "For Whom?" or "For What?"
Proper nouns
A word that answers what or whom when, asked after the verb, is a direct object. An indirect object or an object of a preposition answers what or whom. A direct object, indirect object, and object of a preposition are nouns or pronouns.
Proper nouns
an indirect object
Whom = ος / η / ο . Hope that answers your question.
A noun or pronoun in the form of an object of a preposition answers what or whom. A noun or pronoun as an indirect or direct object also answer what or whom.
A direct object answers what or whom. ex: Give me a dollar. (give me what) ex: I reported him to the police. (reported whom)