evening prayer vs evensong

evening prayer

noun
  • The second of the two services of the Daily Office, combining the canonical hours of vespers and compline. Commonly called evensong, especially when the service is musical. 

  • isha 

evensong

noun
  • A religious service, most commonly seen in the Anglican or Episcopal Church, that takes place in the early hours of the evening; originally, and sometimes still, an alternative name for vespers or a service combining vespers and compline. 

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