companion vs oppo

companion

noun
  • A friend, acquaintance, or partner; someone with whom one spends time or accompanies 

  • A knot in whose neighborhood another, specified knot meets every meridian disk. 

  • An appended source of media or information, designed to be used in conjunction with and to enhance the main material. 

  • A celestial object that is associated with another. 

  • A knight of the lowest rank in certain orders. 

  • The covering of a hatchway on an upper deck which leads to the companionway; the stairs themselves. 

  • The framework on the quarterdeck of a sailing ship through which daylight entered the cabins below. 

  • A thing or phenomenon that is closely associated with another thing, phenomenon, or person. 

oppo

noun
  • A friend, associate or colleague. 

  • Research into one's opponent's family, friends, and past, which aims to uncover activities or interests which embarrass or discredit them. 

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