clustering vs potpourri

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. 

potpourri

noun
  • A collection of various things; an assortment, mixed bag or motley. 

  • A ragout or stew of meat and vegetables. 

  • An anthology of miscellaneous prose. 

  • A mixture of dried fragrant plant material, often in a decorative bowl, used to scent a room. 

  • A medley of songs or music. 

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