consultant vs freelance

consultant

noun
  • A person whose occupation is to be consulted for their expertise, advice, service or help in an area or specialty; a party whose business is to be similarly consulted. 

  • A person or party that is consulted. 

  • A senior hospital-based physician or surgeon who has completed all specialist training and has been placed on the specialist register in their chosen speciality, roughly equivalent to an attending physician in North America. 

freelance

noun
  • Someone who sells their services to clients without a long-term employment contract. 

  • A medieval mercenary. 

adj
  • Of, or relating to a freelance; without employment contract. 

verb
  • To produce or sell services as a freelance. 

  • To work as a freelance. 

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