groomsman vs initiate

groomsman

noun
  • A man who serves as one of a number of attendants to a bridegroom at a wedding, one of whom is the best man. 

initiate

noun
  • One who has been through a ceremony of initiation. 

  • One who is oriented in and familiar with a topic or subject; especially, one who is an expert in it. 

  • A new member of an organization. 

verb
  • To instruct in the rudiments or principles; to introduce. 

  • To do the first act; to perform the first rite; to take the initiative. 

  • To confer membership on; especially, to admit to a secret order with mysterious rites or ceremonies. 

  • To begin; to start. 

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