cherry plum vs wax apple

cherry plum

noun
  • The fruit of such a tree. 

  • Prunus cerasifera, a deciduous ornamental Eurasian shrub or small tree, having white flowers and small red to yellow edible fruits. 

wax apple

noun
  • the fruit of this plant 

  • a tropical plant, Syzygium samarangense, bearing an edible fruit 

How often have the words cherry plum and wax apple occurred in a corpus of books? (source: Google Ngram Viewer )