refrain vs utter

refrain

verb
  • To stop oneself from some action or interference; to abstain. 

  • To abstain from (food or drink). 

noun
  • The chorus or burden of a song repeated at the end of each verse or stanza. 

  • A much repeated comment, complaint, or saying. 

utter

verb
  • To produce (a noise) (of an inanimate object). 

  • To produce (speech or other sounds) with one's voice. 

  • To put (currency) into circulation. 

  • To commit the crime of uttering (knowingly presenting forged documentation). 

  • To reveal or express (an idea, thought, desire, etc.) with speech. 

adj
  • Absolute, unconditional, total, complete. 

  • Outer; furthest out, most remote. 

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