When you get the Pro package you will also get:

  • The world's leading English Dictionaries - Oxford and Merriam Webster, covering both British and American English.
  • Hundreds of thousands of additional words, phrases, synonyms, conjugations and more!
  • Advanced results covering rare, historical, archaic, scientific and technical vocabulary with helpful grammar notes and usage examples.

That is on-top all of what you get in the Classic package.