clustering vs focusing

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. 

focusing

noun
  • The action of the verb to focus. 

adj
  • Used for or pertaining to focusing. 

  • Pertaining to the direction of attention, effort, or energy to a particular audience or purpose over time. 

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