equivocation vs sophistry

equivocation

noun
  • A logical fallacy resulting from the use of multiple meanings of a single expression. 

  • The use of expressions susceptible of a double signification, possibly intentionally and with the aim of misleading. 

sophistry

noun
  • Plausible yet fallacious argumentations or reasoning. 

  • The actions or arguments of a sophist. 

  • An argument that seems plausible, but is fallacious or misleading, especially one devised deliberately to be so; a sophism. 

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