bush league vs layperson

bush league

noun
  • A low-ranking or inferior level among groups, professions, organizations, etc. 

  • A professional sports association at the lower levels of minor league organization. 

adj
  • Of inferior quality. 

  • Amateurish, unprofessional, unpolished, juvenile. 

layperson

noun
  • One who is not intimately familiar with a given subject or activity. 

  • A person who is not a cleric. 

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