buff vs ninja

buff

verb
  • To make a character or an item stronger. 

  • To strike. 

  • To polish and make shiny by rubbing. 

  • To modify a medical chart, especially in a dishonest manner. 

adj
  • Of the color of buff leather, a brownish yellow. 

  • Physically attractive. 

  • Unusually muscular. 

noun
  • Any substance used to dilute (street) drugs in order to increase profits. 

  • Undyed leather from the skin of buffalo or similar animals. 

  • A military coat made of buff leather. 

  • A buffalo, or the meat of a buffalo. 

  • The greyish viscid substance constituting the buffy coat. 

  • Compressive coupler force that occurs during a slack bunched condition. 

  • A brownish yellow colour. 

  • A tool, often one covered with buff leather, used for polishing. 

  • A person who is very interested in a particular subject. 

  • An effect that makes a character or item stronger. 

  • The bare skin. 

ninja

verb
  • To claim an item through abuse of game mechanics. 

  • 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. 

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

noun
  • 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. 

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

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