former vs sometime

former

adj
  • Previous. 

  • First of aforementioned two items. Used with the, often without a noun. 

noun
  • An object used to form something, such as a template, gauge, or cutting die. 

  • Someone who forms something; a maker; a creator or founder. 

  • Someone in, or of, a certain form (class). 

sometime

adj
  • Former, erstwhile; at some previous time. 

  • Occasional. 

adv
  • At an indefinite but stated time in the past or future. 

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