expedition vs pilgrimage

expedition

verb
  • To take part in a trip or expedition; to travel. 

noun
  • An important or long journey, for example a march or a voyage 

  • The group of people making such excursion. 

  • A military journey; an enterprise against some enemy or into enemy territory. 

  • A trip, especially a long one, made by a person or a group of people for a specific purpose 

  • The process or activities of performing expediter tasks. 

pilgrimage

verb
  • To go on a pilgrimage. 

noun
  • A visit to any site revered or associated with a meaningful event. 

  • A journey made to a sacred place, or a religious journey. 

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