outflow vs promotion

outflow

noun
  • Any outward movement. 

  • Something that flows out of a sewage treatment plant. 

  • The process of flowing out. 

  • A fluid that flows out. 

  • A stream of gaseous material emanating from an active galactic nucleus. 

  • The part of a system that allows material to flow out. 

verb
  • To flow outward. 

promotion

noun
  • Forward motion. (Contrast remotion.) 

  • An event intended to increase the reach or image of a product or brand. 

  • Transformation of a pawn into a piece (by reaching the opponent's back rank). 

  • Dissemination of information in order to increase its popularity. 

  • An advancement in rank or position. 

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