oration vs soliloquy

oration

noun
  • A lengthy speech or argument in a private setting. 

  • A specific form of short, solemn prayer said by the president of the liturgical celebration on behalf of the people. 

  • A formal, often ceremonial speech. 

verb
  • To deliver an oration; to speak. 

soliloquy

noun
  • A speech or written discourse in this form. 

  • The act of a character speaking to themselves so as to reveal their thoughts to the audience. 

verb
  • To issue a soliloquy. 

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