cluster vs flock

cluster

noun
  • A number of individuals grouped together or collected in one place; a crowd; a mob. 

  • A sequence of two or more words that occur in language with high frequency but are not idiomatic; a chunk, bundle, or lexical bundle. 

  • A small metal design that indicates that a medal has been awarded to the same person before. 

  • A set of bombs or mines released as part of the same blast. 

  • A logical data storage unit containing one or more physical sectors (see block). 

  • An ensemble of bound atoms or molecules, intermediate in size between a molecule and a bulk solid. 

  • A group of computers that work together. 

  • A group or bunch of several discrete items that are close to each other. 

  • A clusterfuck. 

  • A subset of a population whose members are sufficiently similar to each other and distinct from others as to be considered a distinct group; such a grouping in a set of observed data that is statistically significant. 

  • A group of consonants. 

  • A group of galaxies or stars that appear near each other. 

  • A secundal chord of three or more notes. 

verb
  • To cover with clusters. 

  • To collect into clusters. 

  • To form a cluster or group. 

flock

noun
  • A large number of people. 

  • A large number of animals associated together in a group; commonly used of sheep, but (dated) also used for goats, farmed animals, and a wide variety of animals. 

  • Very fine sifted woollen refuse, especially that from shearing the nap of cloths, formerly used as a coating for wallpaper to give it a velvety or clothlike appearance; also, the dust of vegetable fibre used for a similar purpose. 

  • A number of birds together in a group, such as those gathered together for the purpose of migration. 

  • Those served by a particular pastor or shepherd.herd/flock 

  • Coarse tufts of wool or cotton used in bedding. 

  • A religious congregation. 

  • A lock of wool or hair. 

verb
  • To cover a Christmas tree with artificial snow. 

  • To coat a surface with dense fibers or particles; especially, to create a dense arrangement of fibers with a desired nap. 

  • To treat a pool with chemicals to remove suspended particles. 

  • To congregate in or head towards a place in large numbers. 

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