herd vs trek

herd

verb
  • To move or drive a herd. 

  • To manage, care for or guard a herd 

  • To act as a herdsman or a shepherd. 

  • To unite or associate in a herd 

  • To associate; to ally oneself with, or place oneself among, a group or company. 

  • To unite or associate in a herd; to feed or run together, or in company. 

  • To form or put into a herd. 

noun
  • A number of domestic animals assembled together under the watch or ownership of a keeper. 

  • Any collection of animals gathered or travelling in a company. 

  • A crowd, a mass of people or things; a rabble. 

trek

verb
  • To travel by ox wagon. 

  • To travel by walking. 

  • To journey on foot, especially to hike through mountainous areas. 

  • To make a slow or arduous journey. 

noun
  • A journey by ox wagon. 

  • The Boer migration of 1835-1837. 

  • A long walk. 

  • A slow or difficult journey. 

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