Are there any differences between grief and bereavement?

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Grief is less specific than bereavement.
Bereavement almost always refers to having lost somebody who died and the period after they die, the emotions and processes, etc.
Grief is what many people experience after loss, such as when someone dies as in bereavement but you can grieve the loss of a friend that you don't talk to anymore, the loss of a job you were fired from, etc. So while bereavement almost always involves grief, you don't have to experience bereavement to be grieving, if that makes sense?