mission vs task

mission

noun
  • A set of tasks that fulfills a purpose or duty; an assignment set by an employer, or by oneself. 

  • Religious evangelism. 

  • An infrequent gathering of religious believers in a parish, usually part of a larger regional event with a central theme. 

  • A number of people appointed to perform any service; a delegation; an embassy. 

  • A settlement or building serving as a base for missionary work. 

  • Third World charities, particularly those which preach as well as provide aid. 

verb
  • To do missionary work, proselytize. 

  • To send on a mission. 

task

noun
  • A piece of work done as part of one’s duties. 

  • Any piece of work done. 

  • A difficult or tedious undertaking. 

  • A process or execution of a program. 

  • An objective. 

verb
  • To charge, as with a fault. 

  • To assign a task to, or impose a task on. 

  • To oppress with severe or excessive burdens; to tax 

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