Divine office and Vespers

Divine office noun - Canonical prayers recited daily by priests (e.g. the breviary of the Roman Catholic Church).

Vespers and divine office are semantically related. In some cases you can use "Vespers" instead a noun phrase "Divine office".

Vespers noun - The sixth of the seven canonical hours of the divine office; early evening; now often made a public service on Sundays.

Divine office and vespers are semantically related. You can use "Divine office" instead a noun "Vespers".