oral vs vocative

oral

adj
  • Relating to the transmission of information or literature by word of mouth. 

  • Pronounced by the voice resonating in the mouth, as the vowels in English. 

  • Done or taken by the mouth. 

  • Relating to or denoting a stage of infantile psychosexual development during which libidinal gratification is derived from intake (as of food), by sucking, and later by biting. 

  • Of, relating to, or characterized by personality traits of passive dependency and aggressiveness. 

  • Relating to the mouth. 

  • Using speech or the lips especially in teaching the deaf. 

  • Not having reached the stage of literacy. 

  • Spoken rather than written. 

noun
  • A physical examination of the mouth. 

  • A spoken test or examination, particularly in a language class. 

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. 

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