ululate vs whoop

ululate

verb
  • to howl loudly or prolongedly in lamentation or joy 

  • to produce a rapid and prolonged series of sharp noises with one's voice. 

whoop

verb
  • To shout, to yell. 

  • To make a whoop. 

  • To cough or breathe with a sonorous inspiration, as in whooping cough. 

  • To beat, to strike. 

  • To defeat thoroughly. 

noun
  • A bump on a racetrack. 

  • A loud, eager cry, usually of joy. 

  • A gasp, characteristic of whooping cough. 

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