flock vs stack

flock

noun
  • Coarse tufts of wool or cotton used in bedding. 

  • 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 

  • 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. 

stack

noun
  • A large pile of hay, grain, straw, or the like, larger at the bottom than the top, sometimes covered with thatch. 

  • A combination of interdependent, yet individually replaceable, software components or technologies used together on a system. 

  • A fall or crash, a prang. 

  • A holding pattern, with aircraft circling one above the other as they wait to land. 

  • A number of flues embodied in one structure, rising above the roof. 

  • A blend of various dietary supplements or anabolic steroids with supposed synergistic benefits. 

  • A large amount of an object. 

  • An implementation of a protocol suite (set of protocols forming a layered architecture). 

  • A coastal landform, consisting of a large vertical column of rock in the sea. 

  • A vertical drainpipe. 

  • Compactly spaced bookshelves used to house large collections of books. 

  • A pile of similar objects, each directly on top of the last. 

  • An extensive collection 

  • The amount of money a player has on the table. 

  • The quantity of a given item which fills up an inventory slot or bag. 

  • A pile of wood containing 108 cubic feet. (~3 m³) 

  • A smokestack. 

  • A generalization of schemes in algebraic geometry and of sheaves. 

  • A pile of poles or wood, indefinite in quantity. 

  • A stack data structure stored in main memory that is manipulated during machine language procedure call related instructions. 

  • A pile of rifles or muskets in a cone shape. 

  • A linear data structure in which items inserted are removed in reverse order (the last item inserted is the first one to be removed). 

verb
  • To deliberately distort the composition of (an assembly, committee, etc.). 

  • To place (aircraft) into a holding pattern. 

  • To collect precious metal in the form of various small objects such as coins and bars. 

  • To operate cumulatively. 

  • To arrange the cards in a deck in a particular manner. 

  • To crash; to fall. 

  • To take all the money another player currently has on the table. 

  • To have excessive ink transfer. 

  • To arrange in a stack, or to add to an existing stack. 

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