euthanasiate vs euthanatize

euthanasiate

verb

  • To kill in a humane manner. 

noun

  • Any drug used to euthanize an animal. 

euthanatize

verb

  • To euthanize. 

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