evensong vs vespers

evensong and vespers both are nouns.

Word	Noun	Adjective	Verb	Adverb
evensong	Yes	No	No	No
vespers	Yes	No	No	No

As nouns, evensong and vespers are synonyms defined as:

evensong and vespers: the sixth of the seven canonical hours of the divine office; early evening; now often made a public service on Sundays

evensong (noun)	vespers (noun)
(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
the sixth of the seven canonical hours of the divine office; early evening; now often made a public service on Sundays