enquiring vs interrogatory

enquiring

noun
  • An instance of making an enquiry; an asking. 

adj
  • Curious, inquisitive or investigative. 

interrogatory

noun
  • A question; an interrogation. 

  • A formal question submitted to opposing party to answer, generally governed by court rule. 

adj
  • Serving to interrogate; questioning. 

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