accrue vs acquire

accrue

verb
  • To reach or come to by way of increase; to arise or spring up because of growth or result, especially as the produce of money lent. 

  • To become an enforceable and permanent right. 

  • To increase, to rise 

  • To accumulate. 

  • To be incurred as a result of the passage of time. 

acquire

verb
  • To gain, usually by one's own exertions; to get as one's own 

  • To sample signals and convert them into digital values. 

  • To contract. 

  • To get. 

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