lecture vs speech

lecture

verb
  • To preach, to berate, to scold. 

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

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

  • A berating or scolding. 

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

speech

verb
  • To make a speech; to harangue. 

noun
  • The ability to speak; the faculty of uttering words or articulate sounds and vocalizations to communicate. 

  • A formal session of speaking, especially a long oral message given publicly by one person. 

  • Language used orally, rather than in writing. 

  • An utterance that is quoted; see direct speech, reported speech 

  • Public talk, news, gossip, rumour. 

  • The act of speaking, a certain style of it. 

  • A dialect, vernacular, or (dated) a language. 

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