extraneous vs inner

extraneous

adj
  • Not belonging to, or dependent upon, a thing; without or beyond a thing; foreign 

  • Not essential or intrinsic 

inner

noun
  • A thin glove worn inside batting gloves or wicket-keeping gloves. 

  • One who supports remaining in the European Union. 

  • An inner part. 

  • A forward who plays in or near the center of the field. 

  • The 2nd circle on a target, between the bull (or bull's eye) and magpie. 

  • A duvet, excluding the cover. 

adj
  • Being or occurring (farther) inside, situated farther in, located (situated) or happening on the inside of something, situated within or farther within contained within something. 

  • Close to the centre, located near or closer to center. 

  • Inside or closer to the inside of the body. 

  • Privileged, more or most privileged, more or most influential, intimate, exclusive, more important, more intimate, private, secret, confined to an exclusive group, exclusive to a center; especially a center of influence being near a center especially of influence. 

  • Of mind or spirit, relating to the mind or spirit, to spiritual or mental processes, mental, spiritual, relating to somebody's private feelings or happening in somebody's mind, existing as an often repressed part of one's psychological makeup. 

  • Not obvious, private, not expressed, not apparent, hidden, less apparent, deeper, obscure; innermost or essential; needing to be examined closely or thought about in order to be seen or understood. 

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