frond vs inflorescence

frond

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

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

inflorescence

noun
  • An instance of a plant beginning to flower. 

  • Flower cluster; a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. 

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