high-wire vs tightrope walker

high-wire

noun

  • A wire strung high above the ground which is used for acrobatic stunts. 

adj

  • Very risky and daring. 

  • Pertaining to a wire strung high above the ground which is used for acrobatic stunts. 

tightrope walker

noun

  • An acrobat who practices tightrope walking. 

How often have the words high-wire and tightrope walker occurred in a corpus of books? (source: Google Ngram Viewer )