clustering vs zoo

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. 

zoo

noun
  • A large and varied collection of something. 

  • A zoophile. 

  • A park where live animals are exhibited. 

  • The jungle. 

  • Any place that is wild, crowded, or chaotic. 

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