vocative vs voluble

vocative

adj
  • Of or pertaining to calling; used in calling or vocation. 

  • Used in address; appellative (said of that case or form of the noun, pronoun, or adjective, in which a person or thing is addressed). For example "Domine, O Lord" 

noun
  • The vocative case 

  • A word in the vocative case 

  • Something said to (or as though to) a particular person or thing; an entreaty, an invocation. 

voluble

adj
  • Of thoughts, feelings, or something that is expressed: expressed readily or at length and in a fluent manner. 

  • Fluent or having a ready flow of speech. 

  • Twisting and turning like a vine. 

  • Easily rolling or turning; having a fluid, undulating motion. 

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