reflux vs ripple

reflux

noun
  • The backwards flow of any fluid. 

  • A technique, using a reflux condenser, allowing one to boil the contents of a vessel over an extended period. 

  • The leaking of stomach acid up into the oesophagus. 

verb
  • To boil a liquid in a vessel having a reflux condenser 

  • To flow back or return. 

ripple

noun
  • A moving disturbance, or undulation, in the surface of a fluid. 

  • A style of ice cream in which flavors have been coarsely blended together. 

  • An implement, with teeth like those of a comb, for removing the seeds and seed vessels from flax, broom corn, etc. 

  • A small oscillation of an otherwise steady signal. 

  • A sound similar to that of undulating water. 

verb
  • To shape into a series of ripples. 

  • To launch or unleash in rapid succession. 

  • To scratch, tear, or break slightly; graze 

  • To propagate like a moving wave. 

  • To move like the undulating surface of a body of water; to undulate. 

  • To remove the seeds from (the stalks of flax, etc.), by means of a ripple. 

  • To make a sound as of water running gently over a rough bottom, or the breaking of ripples on the shore. 

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