vowelize vs warble

vowelize

verb
  • To give the quality, sound, or office of a vowel to. 

  • To insert a vowel or vowels into. 

warble

verb
  • To modulate a tone's frequency. 

  • To cause to quaver or vibrate. 

  • To be quavered or modulated; to be uttered melodiously. 

  • To sing like a bird, especially with trills. 

noun
  • In naval mine warfare, the process of varying the frequency of sound produced by a narrowband noisemaker to ensure that the frequency to which the mine will respond is covered. 

  • A small hard swelling on a horse's back, caused by the galling of the saddle. 

  • The sound of one who warbles; singing with trills or modulations. 

  • A lesion under the skin of cattle, caused by the larva of a bot fly of genus Hypoderma. 

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