excursion vs expedition

excursion

verb
  • To go on a recreational trip or excursion. 

noun
  • An occurrence where an aircraft runs off the end or side of a runway or taxiway, usually during takeoff, landing, or taxi. 

  • A deviation in pitch, for example in the syllables of enthusiastic speech. 

  • A brief recreational trip; a journey out of the usual way. 

  • A wandering from the main subject: a digression. 

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. 

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