concourse vs swarm

concourse

noun
  • A large group of people; a crowd. 

  • The running or flowing together of things; the meeting of things; confluence. 

  • An open space, especially in a park, where several roads or paths meet. 

  • Airport terminal. 

  • A large open space in or in front of a building where people can gather, particularly one joining various paths, as in a rail station or airport terminal, or providing access to and linking the platforms in a railway terminus. 

swarm

noun
  • A mass of people, animals or things in motion or turmoil. 

  • A large number of insects, especially when in motion or (for bees) migrating to a new colony. 

  • A group of nodes sharing the same torrent in a BitTorrent network. 

verb
  • To fill a place as a swarm. 

  • To climb by gripping with arms and legs alternately. 

  • To overwhelm as by an opposing army. 

  • To breed multitudes. 

  • To move as a swarm. 

  • To teem, or be overrun with insects, people, etc. 

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