doorstep vs starting point

doorstep

noun
  • One's immediate neighbourhood or locality. 

  • An outside step leading up to the door of a building, usually a home. 

  • A thick slice, especially of bread. 

verb
  • To visit one household after another to solicit sales, charitable donations, political support, etc. 

  • To corner somebody for an unexpected interview. 

starting point

noun
  • The place where a journey starts. 

  • The first steps when commencing an activity. 

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