nonstop vs sometimes

nonstop

noun
  • A linguistic sound that is not a stop; a continuant. 

  • A convenience store in parts of Europe, open 24 hours a day. 

  • A nonstop journey, especially a nonstop flight. 

adj
  • Without stopping; without interruption or break. 

  • Describing a point mutation within a stop codon that causes the continued translation of an mRNA strand. 

adv
  • Without stopping; without interruption or break 

sometimes

adv
  • On certain occasions, or in certain circumstances, but not always. 

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