Grief is the immediate feeling or intensity of loss, while grieving is the process of how that grief changes over time.

“So, grief is that, in that moment, you know, I could say, "Andrew, on a scale of 1 to 10, how much grief are you feeling right now?" And you would be able to tell me right now, during this wave of grief, how you're doing. But grieving is the way that grief changes over time.”