1. pro bono done for the public good without compensation
  2. profound situated at or extending to great depth
  3. propane colorless gas found in natural gas and petroleum
  4. propene a flammable gas obtained by cracking petroleum
  5. bare bone bone stripped of flesh
  6. probing diligent and thorough in inquiry or investigation
  7. bourbon whiskey distilled from a mash of corn and malt and rye
  8. Bourbon a European royal line that ruled in France (from 1589-1793) and Spain and Naples and Sicily
  9. proton a stable particle with positive charge
  10. profane grossly irreverent toward what is held to be sacred
  11. progeny the immediate descendants of a person
  12. pronoun a function word that is used in place of a noun
  13. prone having a tendency
  14. propound put forward, as of an idea
  15. probity complete and confirmed integrity
  16. protein an organic compound essential to living cells
  17. propanone the simplest ketone
  18. Procyon the brightest star in Canis Minor
  19. protean taking on different forms
  20. probation a trial period during which one's abilities are tested