always vs perpetually

always

adv
  • At all times; throughout all time; since the beginning. 

  • Constantly during a certain period, or regularly at stated intervals (opposed to sometimes or occasionally). 

  • In any event. 

perpetually

adv
  • Seeming to never end; endlessly; constantly. 

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