certain vs express

certain

adj
  • Not to be doubted or denied; established as a fact. 

  • Unfailing; infallible. 

  • Known but not specifically named; indeterminate; indefinite; one or some; sometimes used independently as a noun, and meaning certain persons; see also "one". 

  • Fixed or stated; regular; determinate. 

  • Sure, positive, not doubting. 

  • Actually existing; sure to happen; inevitable. 

pron
  • Unnamed or undescribed members (of). 

det
  • Having been determined but not specified. 

express

adj
  • Specific or precise; directly and distinctly stated; not merely implied. 

  • Truly depicted; exactly resembling. 

  • Moving or operating quickly, as a train not making local stops. 

  • Providing a more limited but presumably faster service than a full or complete dealer of the same kind or type. 

noun
  • An express office. 

  • That which is sent by an express messenger or message. 

  • A mode of transportation, often a train, that travels quickly or directly. 

  • A service that allows mail or money to be sent rapidly from one destination to another. 

  • An express rifle. 

  • A messenger sent on a special errand; a courier. 

verb
  • To transcribe deoxyribonucleic acid into messenger RNA. 

  • To convey or communicate; to make known or explicit. 

  • To press, squeeze out (especially said of milk). 

  • To translate messenger RNA into protein. 

adv
  • Moving or operating quickly, as a train not making local stops. 

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