generally vs oftentimes

generally

adv
  • Popularly or widely. 

  • As a rule; usually. 

  • Without reference to specific details. 

  • In the general case, without exception. 

oftentimes

adv
  • (elsewhere, archaic) Frequently; often 

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