declarative vs interrogative

declarative

noun
  • Synonym of declaration (declarative statement) 

adj
  • A way of programming that is most akin to just stating what is wanted, rather than having to describe how to do it. w:Declarative programming 

  • That declares a construct. 

  • Expressing truth. 

  • Serving to declare; having the quality of a declaration. 

interrogative

noun
  • A question; an interrogation. 

  • A word (pronoun, pronominal adjective, or adverb) implying interrogation, or used for asking a question: why, who, when, etc. 

adj
  • Asking or denoting a question: as, an interrogative phrase, pronoun, or point. 

  • Pertaining to inquiry; questioning 

How often have the words declarative and interrogative occurred in a corpus of books? (source: Google Ngram Viewer )