Other forms: caregivers
Someone who takes care of a very young, elderly, or ill person is called a caregiver. If you make sure your ailing friend eats every day and is relatively comfortable, you are her caregiver.
Being a caregiver is sometimes a paying job — a home health aid and a nurse in a hospital both work as caregivers. When a family member is ill, you may become a temporary caregiver, bringing hot soup and warm blankets. In Britain, this person is called a carer. Both words come from the Old English carian, "to feel concern" and also "to grieve."