interrogative in WordNet English dictionary

1. a sentence of inquiry that asks for a reply
   "he asked a direct question"; "he had trouble phrasing his interrogations"
   question  interrogation  interrogative  interrogative sentence 
   
2. some linguists consider interrogative sentences to constitute a mood
   interrogative mood  interrogative 
   

1. relating to the use of or having the nature of an interrogation
   interrogative  interrogatory 
   
2. relating to verbs in the so-called interrogative mood
   "not all questions have an interrogative construction"
   interrogative