hard candy vs lozenge

hard candy

noun
  • A candy prepared from one or more syrups boiled to a temperature of 160°C (320°F), thereafter becoming stiff and brittle at room temperature. 

lozenge

noun
  • A small tablet (originally diamond-shaped) or medicated sweet used to ease a sore throat. 

  • A quadrilateral with sides of equal length (rhombus), having two acute and two obtuse angles. 

verb
  • To mark or emblazon with a lozenge. 

  • To form into the shape of a lozenge. 

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