kingcup vs primrose

kingcup

noun
  • Any of various species of buttercup, or the marsh marigold, Caltha palustris. 

primrose

noun
  • A flowering plant of the genus Primula. 

  • A flower of a primrose plant. 

  • A light yellow colour. 

  • Specifically, the species Primula acaulis (syn. Primula vulgaris), also called common primrose. 

  • A plant of the family Primulaceae. 

  • A plant of the genus Oenothera, better known as an evening primrose. 

adj
  • Of a light yellow colour. 

verb
  • To pick primroses. 

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