singing vs vocative

singing

noun
  • Disclosing information, or giving evidence about another. 

  • The act of using the voice to produce musical sounds; vocalizing. 

  • A gathering for the purpose of singing shape note songs. 

adj
  • Producing a whistling sound due to the escape of steam. 

  • Smooth and flowing. 

vocative

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

  • The vocative case 

  • A word in the vocative case 

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" 

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