collum vs stiffener

collum

noun
  • A collar 

  • A neck, cervix, or neckline part or process. 

stiffener

noun
  • Anything added to something in order to stiffen it, such as a support beam, or starch for a collar. 

  • An alcoholic drink taken to fortify oneself. 

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