iceberg vs impersonal

iceberg

noun
  • An aloof person. 

  • A huge mass of ocean-floating ice which has broken off a glacier or ice shelf 

  • An impending disastrous event whose adverse effects are only beginning to show, in reference to one-tenth of the volume of an iceberg being visible above water. 

impersonal

noun
  • An impersonal word or construct. 

adj
  • Lacking warmth or emotion; cold. 

  • Not having a subject, or having a third person pronoun without an antecedent. 

  • Not personal; not representing a person; not having personality. 

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