crowning vs first base

crowning

noun
  • The stage of vaginal childbirth when the infant's head remains consistently visible at the vulva. 

  • A coronation. 

  • The act of one who crowns (in various senses). 

adj
  • Supreme; of a surpassing quality or quantity. 

first base

noun
  • Kissing, regarded as the first phase of a sexual relationship. 

  • The base after home plate in a counter-clockwise path around a baseball infield. 

  • Completion of the first phase of an activity. 

  • The betting spot located immediately to the left of the dealer, which is first to receive cards and first to act. 

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