interrogative
/ˌɪntəˈrɑːgətɪv/
adjective
grammar
having the form of a question rather than a statement or command
used to ask a question
formal :asking a question :having the form or force of a question
noun
plural -tives
[count] grammar :a word (such as who, what, or which) that is used in asking a question
the interrogative
the form that a phrase or sentence has when it is asking a question