conveniently vs usefully

conveniently

adv
  • In a convenient manner, form, or situation; without difficulty. 

  • In a manner provoking suspicion due to how well it suits someone's purposes. 

usefully

adv
  • In a useful manner; in a way that achieves something 

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