decklid vs portmanteau

decklid

noun
  • The cover over the trunk or boot of a motor vehicle. 

portmanteau

noun
  • A large travelling case usually made of leather, and opening into two equal sections. 

  • A portmanteau word. 

  • A portmanteau film. 

verb
  • To make a portmanteau word. 

adj
  • Made by combining two (or more) words, stories, etc., in the manner of a linguistic portmanteau. 

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