flock vs separation

flock

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. 

noun
  • 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 large number of people. 

  • 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. 

separation

noun
  • Departure from active duty, while not necessarily leaving the service entirely. 

  • An agreement legalizing such an arrangement. 

  • An object that separates two spaces. 

  • The act of disuniting two or more things, or the condition of being separated. 

  • The act or condition of two or more people being separated from one another. 

  • The place at which a division occurs. 

  • An interval, gap or space that separates things or people. 

  • The act or condition of a married couple living in separate homes while remaining legally married. 

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