expedition vs problem

expedition

noun
  • The process or activities of performing expediter tasks. 

  • 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 

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

problem

noun
  • A question to be answered, schoolwork exercise. 

  • A difficulty that has to be resolved or dealt with. 

  • A puzzling circumstance. 

  • A set of moves required to complete a climb. 

  • Objection. 

  • Difficulty in accepting or understanding or refusal to accept or understand. 

adj
  • Causing a problem; problematic; troublesome. 

  • Difficult to train or guide; unruly. 

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