manifest vs unknown

manifest

adj
  • Obvious to the understanding; apparent to the mind; easily apprehensible; plain; not obscure or hidden. 

  • Evident to the senses, especially to the sight; apparent; distinctly perceived. 

  • Detected; convicted. 

verb
  • To will something to exist. 

  • To show plainly; to make to appear distinctly, usually to the mind; to put beyond question or doubt; to display; to exhibit. 

  • To exhibit the manifests or prepared invoices of; to declare at the customhouse. 

  • To become manifest; to be revealed. 

noun
  • A list or invoice of the passengers or goods being carried by a commercial vehicle or ship. 

  • A file containing metadata describing other files. 

unknown

adj
  • Not known; unidentified; not well known. 

noun
  • A variable (usually x, y or z) whose value is to be found. 

  • A person of no identity; a nonentity 

  • Any thing, place, or situation about which nothing is known; an unknown fact or piece of information. 

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