gush vs riffle

gush

verb
  • To flow forth suddenly, in great volume. 

  • To make an excessive display of enthusiasm, praise, or sentiment. 

  • To send (something) flowing forth suddenly in great volume. 

  • To ejaculate during orgasm. 

noun
  • A sudden rapid outflow. 

riffle

verb
  • To flow over a swift, shallow part of a stream. 

  • To ruffle with a rippling action. 

  • To skim or flick through the pages of a book. 

  • To shuffle playing cards by separating the deck in two and sliding the thumbs along the edges of the cards to mix the two parts. 

  • To leaf through rapidly. 

  • To idly manipulate objects with the fingers. 

  • To prepare samples of material using a riffler. 

noun
  • A succession of small waves. 

  • A swift, shallow part of a stream causing broken water. 

  • A quick skim through the pages of a book. 

  • A trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferous earth is washed. Also one of the cleats, grooves or steps in such trough. 

  • In seal engraving, a small metal disc at the end of a tool. 

  • The act of shuffling cards; the sound made while shuffling cards. 

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