incentive vs vagrant

incentive

adj
  • Inciting; encouraging or moving; rousing to action; stimulating. 

  • Serving to kindle or set on fire. 

noun
  • Something that motivates, rouses, or encourages. 

  • A bonus or reward, often monetary, to work harder. 

vagrant

adj
  • Moving without a certain direction; roving, wandering; also, erratic, unsettled. 

  • Wandering from place to place, particularly when without any settled employment or habitation. 

  • Of or pertaining to a vagabond or vagrant, or a person fond of wandering. 

noun
  • An animal, typically a bird, found outside its species' usual range. 

  • Vagrans egista, a widely distributed Asian butterfly of the family Nymphalidae. 

  • A person without settled employment or habitation who usually supports himself or herself by begging or some dishonest means; a tramp, a vagabond. 

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