onrush vs surge

onrush

verb
  • To rush or flow forward forcefully. 

  • To assault aggressively. 

noun
  • An aggressive assault. 

  • A forceful rush or flow forward. 

surge

verb
  • To accelerate forwards, particularly suddenly. 

  • To slack off a line. 

  • To experience a momentary reversal of airflow through the compressor section due to disruption of intake airflow. 

  • To rush, flood, or increase suddenly. 

noun
  • A deployment in large numbers at short notice. 

  • The maximum amplitude of a vehicle's forward/backward oscillation. 

  • The tapered part of a windlass barrel or a capstan, upon which the cable surges, or slips. 

  • A sudden transient rush, flood or increase. 

  • A momentary reversal of the airflow through the compressor section of a jet engine due to disruption of the airflow entering the engine's air intake, accompanied by loud banging noises, emission of flame, and temporary loss of thrust. 

  • A sudden electrical spike or increase of voltage and current. 

  • The swell or heave of the sea (FM 55-501). 

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