apparent vs internal

apparent

adj
  • Appearing to the eye or mind (distinguished from, but not necessarily opposed to, true or real); seeming. 

  • Capable of being seen, or easily seen; open to view; visible to the eye, eyely; within sight or view. 

  • Clear or manifest to the understanding; plain; evident; obvious; known; palpable; indubitable. 

internal

adj
  • Experienced in one's mind; inner rather than expressed. 

  • Within the body. 

  • Concerned with the domestic affairs of a nation, state or other political community. 

  • Of the inner nature of a thing. 

  • Applied or intended for application through the stomach by being swallowed. 

  • Concerned with the non-public affairs of a company or other organisation. 

  • Attending a university as well as taking its examinations. 

  • Of or situated on the inside. 

  • Present or arising within an organism or one of its parts. 

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