waterleaf vs watermelon

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. 

watermelon

noun
  • A plant of the species Citrullus lanatus, bearing a melon-like fruit. 

  • A pinkish-red colour, like that of watermelon flesh (also called watermelon pink). 

  • A project that is presented as on schedule when it actually has parts that are falling behind. 

  • The fruit of the watermelon plant, having a green rind and watery flesh that is typically bright red when ripe and contains black pips. 

  • An environmentalist with socialist leanings. 

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