lecture vs oration

lecture

noun
  • A spoken lesson or exposition, usually delivered to a group. 

  • a class that primarily consists of a (weekly or other regularly held) lecture (as in sense 1) 

  • A berating or scolding. 

verb
  • To preach, to berate, to scold. 

  • To teach (somebody) by giving a speech on a given topic. 

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. 

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