agendum vs gimmick

agendum

noun
  • Something to be done; a practical duty, rather than an article of faith. 

gimmick

noun
  • A clever ploy or strategy. 

  • A trick or device used to attain some end. 

  • A night out with one's friends. 

  • A gimmick capacitor. 

verb
  • To rig or set up with a trick or device. 

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