Question Words, "a word that is used to display the question." Use the write begins the sentence: Who, Whose, What, When, Where, Why, How, How, Which, Whom many, How much.
Question Words "a term used to question" the author begins a sentence including the Who, Whose, What, When, Where, Why, Which, Whom, How, How many, How much.
Question Words "words used to express the question" is written at the beginning of a sentence, i.e., Who Whose What When,,,,,, Where Why Which Whom How How,,, Many How, much.