endue vs heighten

endue

verb
  • To take on, to take the form of. 

  • To invest (someone) with a given quality, property etc.; to endow. 

  • To put on (a piece of clothing); to clothe (someone with something). 

heighten

verb
  • To make high; to raise higher; to elevate. 

  • To advance, increase, augment, make larger, more intense, stronger etc. 

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