heterologous vs varietal

heterologous

adj
  • Of, or relating to different species 

  • Having different relationships or different elements 

varietal

adj
  • Pertaining to a distinct variety of organism. 

  • Of or relating to a variety of a language. 

  • Made from a single specific variety (especially of grapes in wine). 

noun
  • A wine made primarily from or exclusively from a single variety of grape, which carries the name of that grape. 

  • A coffee made primarily from or exclusively from a single variety of coffee bean. 

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