airhead vs bush league

airhead

noun
  • A foolish, silly, or unintelligent person. 

  • A (usually temporary) landing area for aircraft for supplying a non-military operation. 

  • An area of hostile territory that has been seized for use as an airbase to ensure the further safe landing of troops and materiel. 

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. 

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