Afterbirth = the placenta and fetal membranes that are expelled after delivery

• She arched suddenly and the afterbirth shot out.
• The afterbirth was large.

Afterlife = the life, for example. in heaven which some people believe begins after death

• He doesn’t believe in an afterlife or immortality.
• They will be reunited in the afterlife.
• Most Christians believe in an afterlife of some sort.
• Do you believe in an afterlife?