Afterlife and By-and-by

Afterlife noun - Life after death.

By-and-by and afterlife are semantically related. In some cases you can use "By-and-by" instead a noun "Afterlife".

By-and-by noun - Time that is to come.

Afterlife and by-and-by are semantically related. Sometimes you can use "Afterlife" instead a noun phrase "By-and-by".