onrush vs swiftness

onrush

noun

  • A forceful rush or flow forward. 

  • An aggressive assault. 

verb

  • To assault aggressively. 

  • To rush or flow forward forcefully. 

swiftness

noun

  • The state of being swift. 

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