clustering vs debate

clustering

noun
  • A prewriting technique consisting of writing ideas down on a sheet of paper around a central idea within a circle, with the related ideas radially joined to the circle using rays. 

  • The undesirable contiguous grouping of elements in a hash table. 

  • A grouping of a number of similar things. 

  • The grouping of a population based on ethnicity, economics or religion. 

adj
  • Forming a cluster. 

debate

noun
  • An argument, or discussion, usually in an ordered or formal setting, often with more than two people, generally ending with a vote or other decision. 

  • An informal and spirited but generally civil discussion of opposing views. 

  • A type of literary composition, taking the form of a discussion or disputation, commonly found in the vernacular medieval poetry of many European countries, as well as in medieval Latin. 

  • Discussion of opposing views. 

verb
  • To consider (to oneself), to think over, to attempt to decide 

  • To participate in a debate; to dispute, argue, especially in a public arena. 

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