Eve and Vesper

Eve noun - The time from when the sun begins to set to the onset of total darkness.

Vesper is a synonym for eve in start topic. In some cases you can use "Vesper" instead a noun "Eve".

Vesper noun - A late afternoon or evening worship service.

Eve is a synonym for vesper in start topic. You can use "Eve" instead a noun "Vesper", if it concerns topics such as evening.