crossbreed vs interbreed

crossbreed

verb
  • To produce (an organism) by the mating of individuals of different breeds, varieties, or species; hybridize. 

  • To mate so as to produce a hybrid; interbreed. 

  • To mate (an organism) with another organism so as to produce a hybrid. 

noun
  • An organism produced by mating of individuals of different varieties or breeds. 

interbreed

verb
  • To breed or reproduce within a heterogenous community, the products of which produce hybrids. 

  • To breed or reproduce within an isolated community. 

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