preferably vs worse

preferably

adv
  • In preference; by choice; in a preferable manner. 

worse

adv
  • Used to start a sentence describing something that is worse. 

  • Less skillfully. 

  • More severely or seriously. 

noun
  • That which is worse; something less good. 

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