Evening Prayer vs evensong

Evening Prayer and evensong both are nouns.

Word	Noun	Adjective	Verb	Adverb
Evening Prayer	Yes	No	No	No
evensong	Yes	No	No	No

As nouns, Evening Prayer and evensong are synonyms defined as:

Evening Prayer and evensong: (Anglican Church) a daily evening service with prayers prescribed in the Book of Common Prayer

Evening Prayer (noun)	evensong (noun)
(Anglican Church) a daily evening service with prayers prescribed in the Book of Common Prayer	(Anglican Church) a daily evening service with prayers prescribed in the Book of Common Prayer
	the sixth of the seven canonical hours of the divine office; early evening; now often made a public service on Sundays