bank account vs savings account

bank account

noun
  • A fund, held by a bank in a contractual arrangement between the bank and the owner of the fund, a customer of the bank, into which they can deposit and from which they can withdraw money. 

savings account

noun
  • A bank account designed for a client's savings, which compared to a current account typically entails withdrawal restrictions but yields a better interest 

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