frond vs petal

frond

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

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

petal

noun
  • One of the component parts of the corolla of a flower. It applies particularly, but not necessarily only, when the corolla consists of separate parts, that is when the petals are not connately fused. Petals are often brightly colored. 

  • A lobe of a rose (geometric shape). 

  • Term of endearment. 

verb
  • To spread out from, like the petals of a flower 

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