cauterise vs cauterize

cauterise

verb

  • To burn, sear, or freeze tissue using a hot iron, electric current or a caustic agent. 

cauterize

verb

  • To burn, sear, or freeze tissue using a hot iron, electric current or a caustic agent. 

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