pepo vs waterleaf

pepo

noun
  • A plant producing such a fruit. 

  • A fruit of plants of the gourd family Cucurbitaceae, possessing a hard rind and producing many seeds in a single, central, pulpy chamber. 

waterleaf

noun
  • A tropical plant (Talinum fruticosum), the leaves of which are eaten as a vegetable. 

  • Any plant of the genus Hydrophyllum. 

  • A leaf-shaped decoration used on the capitals of columns in late 12th-century Romanesque architecture 

  • An absorbent unsized paper like blotters as opposed to slake-sized or hard sized papers. 

  • Any plant of Hydrophyllaceae, the waterleaf family. 

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