lecture vs rag week

lecture

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. 

verb
  • To preach, to berate, to scold. 

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

rag week

noun
  • An annual event in many universities where students engage in unusual activities to raise money for charity. 

  • The days of the month when a woman has her period. 

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