flit vs mongrelize

flit

verb
  • To move a tethered animal to a new, grazing location. 

  • To move quickly from one location to another. 

  • To move about rapidly and nimbly. 

  • To move house (sometimes a sudden move to avoid debts). 

  • To be unstable; to be easily or often moved. 

  • To unpredictably change state for short periods of time. 

noun
  • A particular, unexpected, short lived change of state. 

  • A fluttering or darting movement. 

mongrelize

verb
  • To breed a mongrel 

  • To cross-breed 

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