memorialize vs perpetuate

memorialize

verb
  • To create a written record of a meeting or conversation. 

  • To provide a memorial for someone; to commemorate. 

  • To convert (someone’s profile) into a memorial site/page (e.g. on Facebook). 

perpetuate

verb
  • To record (the testimony of a witness) which may be lost before a matter comes to trial. 

  • To make (something) perpetual; to make (something) continue for an indefinite time; also, to preserve (something) from extinction or oblivion. 

  • To prolong the existence of (something) by repetition; to reinforce. 

adj
  • Perpetual, or made perpetual; continued for an indefinite time. 

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