horde

noun
  1. 1

    A wandering troop or gang; especially, a clan or tribe of a nomadic people (originally Tatars) migrating from place to place for the sake of pasturage, plunder, etc.; a predatory multitude.

  2. 2

    A large number of people.

    We were beset by a horde of street vendors who thought we were tourists and would buy their cheap souvenirs.

verb
  1. 1

    To travel en masse, to flock

Source: https://en.wiktionary.org/wiki/horde