ninja vs specialist

ninja

noun
  • A person considered similarly skillful to the historical ninja, especially in covert or stealthy operation. 

  • A person considered to look like the historical ninja in some way, including (Mongolia, historical slang) amateur private miners. 

  • Synonym of man as a friendly term of address. 

  • A person trained in ninjutsu, especially (historical) one used for espionage, assassination, and other tasks requiring stealth during Japan's shogunate period. 

adj
  • Of or related to ninjas in their various senses. 

verb
  • Synonym of preempt: to supersede and invalidate a response by posting immediately before it. 

  • To act or move like a ninja, particularly with regard to a combination of speed, power, and stealth. 

  • To claim an item through abuse of game mechanics. 

specialist

noun
  • Someone who is an expert in, or devoted to, some specific branch of study or research. 

  • A stenotopic species. 

  • A physician whose practice is limited to a particular branch of medicine or surgery. 

  • Any of several non-commissioned ranks corresponding to that of corporal. 

  • An organism that is specialized for a particular environment. 

adj
  • Specialised, involving detailed knowledge of a restricted topic. 

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