lecture vs rag

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. 

rag

verb
  • To scold or tell off; to torment; to banter. 

  • To dance to ragtime music. 

  • To play or compose (a piece, melody, etc.) in syncopated time. 

  • To drive a car or another vehicle in a hard, fast or unsympathetic manner. 

  • To decorate (a wall, etc.) by applying paint with a rag. 

  • To become tattered. 

  • To tease or torment, especially at a university; to bully, to haze. 

  • To cut or dress roughly, as a grindstone. 

  • To break (ore) into lumps for sorting. 

noun
  • A poor, low-ranking kicker. 

  • A society run by university students for the purpose of charitable fundraising. 

  • A shabby, beggarly fellow; a ragamuffin. 

  • A coarse kind of rock, somewhat cellular in texture; ragstone. 

  • A ragtime song, dance or piece of music. 

  • A curtain of various kinds. 

  • A sail, or any piece of canvas. 

  • Sanitary napkins, pads, or other materials used to absorb menstrual discharge. 

  • A piece of old cloth, especially one used for cleaning, patching, etc.; a tattered piece of cloth; a shred or tatter. 

  • A newspaper or magazine, especially one whose journalism is considered to be of poor quality. 

  • Tattered clothes. 

  • A ragged edge in metalworking. 

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