frond vs stylet

frond

noun
  • The leaf of a fern, especially a compound leaf. 

  • Any fern-like leaf or other object resembling a fern leaf. 

stylet

noun
  • A style of a plant's flower. 

  • A slender medical probe or device. 

  • A stiff, slender organ of an animal. 

  • An engraving tool, a stylus. 

  • A poniard or stiletto. 

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