Godspeed and Swan song

Godspeed noun - An expression of good wishes at parting.

Swan song and godspeed are semantically related. in farewell statement topic. In some cases you can use "Swan song" instead a noun "Godspeed".

Swan song noun - A final performance or effort (especially before retirement).

Godspeed and swan song are semantically related. Sometimes you can use "Godspeed" instead a noun phrase "Swan song".