errant vs vagrant

errant

adj
  • Roving around; wandering. 

  • Prone to making errors; misbehaving. 

  • Straying from the proper course or standard, or outside established limits. 

noun
  • A knight-errant. 

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 errant and vagrant occurred in a corpus of books? (source: Google Ngram Viewer )