amateur vs layman

amateur

noun
  • Someone who is unqualified or insufficiently skillful. 

  • A person attached to a particular pursuit, study, science, or art (such as music or painting), especially one who cultivates any study, interest, taste, or attachment without engaging in it professionally. 

adj
  • Showing a lack of professionalism, experience or talent. 

  • Non-professional. 

  • Created, done, or populated by amateurs or non-professionals. 

layman

noun
  • Someone who is not a professional in a given field. 

  • A common person. 

  • Layperson, someone who is not an ordained cleric or member of the clergy. 

  • A generally ignorant person. 

  • Lay-sister or lay-brother, person received into a convent of monks, following the vows, but not being member of the order. 

  • A person who is untrained or lacks knowledge of a subject. 

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