equivocation vs hedging

equivocation

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

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

hedging

noun
  • The use of intentionally ambiguous or noncommittal statements. 

  • The act of one who hedges (in various senses). 

  • Any plant used to form a hedge. 

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