bush league vs professional

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. 

professional

noun
  • A person who belongs to a profession 

  • A reputation known by name 

  • A prostitute 

  • An expert 

  • One of four categories of sociologist propounded by Horowitz: a sociologist who is actively concerned with promoting the profession of sociology. 

  • A person who earns their living from a specified activity 

adj
  • Expert. 

  • Of, pertaining to, or in accordance with the (usually high) standards of a profession. 

  • That is carried out for money, especially as a livelihood. 

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