clustering vs compendium

clustering

noun
  • A grouping of a number of similar things. 

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

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

adj
  • Forming a cluster. 

compendium

noun
  • A list or collection of various items. 

  • A collection of board games packaged in a single box. 

  • A short, complete summary; an abstract. 

  • A collected body of information on the standards of strength, purity, and quality of drugs. 

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