advisor vs consultant

advisor

noun
  • One who offers advice. 

  • A xiangqi piece, that is moved one point diagonally and confined within the palace. 

consultant

noun
  • A person or party that is consulted. 

  • 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 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. 

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