misnomer vs vulgarism

misnomer

noun
  • A use of a term that is misleading; a misname. 

  • something asserted not to be true; a myth or mistaken belief 

  • A term whose sense in common usage conflicts with a technical sense. 

  • A term that is misleading, even if it may not be incorrect. 

verb
  • To use a misleading term; to misname. 

vulgarism

noun
  • A spelling, word, or phrase used in common speech that is considered improper or incorrect for formal communication. 

  • Editors of newspapers allow more vulgarisms to go to print today than they used to. 

  • A word or term that is considered offensive or vulgar. 

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