grex vs shellac

grex

noun
  • A multicellular aggregate of amoeba. 

  • A kind of group used in horticultural nomenclature, applied to the progeny of an artificial cross from specified parents, in particular for orchids. 

shellac

noun
  • A processed secretion of the lac insect, Coccus lacca; used in polishes, varnishes etc. 

  • A beating; a thrashing. 

verb
  • To coat with shellac. 

  • To inflict a heavy defeat upon. 

  • To beat; to thrash. 

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