misstep vs spontaneous abortion

misstep

noun

  • An error or mistake. 

  • A step that is wrong, a false step. 

verb

  • To step badly or incorrectly. 

  • To make an error or mistake. 

spontaneous abortion

noun

  • A miscarriage. 

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