Hesperus and Vesper

Hesperus noun - A planet (usually Venus) seen at sunset in the western sky.

Vesper and Hesperus are semantically related. in planet seen in west at sunset topic. In some cases you can use "Vesper" instead a noun "Hesperus".

Vesper noun - A late afternoon or evening worship service.

Hesperus and vesper are semantically related. You can use "Hesperus" instead a noun "Vesper".