ambo vs ambulanceman

ambo

noun
  • An ambulance driver. 

  • A stationary podium used for readings and homilies. 

  • A raised platform in an early Christian church, as well as in the Eastern Orthodox, Oriental Orthodox, and Eastern Catholic churches. 

  • An ambulance. 

ambulanceman

noun
  • A man who is a driver of an ambulance or a member of its crew 

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