Accidental death coverage is not just another version of ordinary term life.
This is one of the most important distinctions in the whole series.
Regular term life is built to pay if the insured dies during the term. Accident-only coverage is built to pay only if death is caused by a qualifying accident.
In plain English, ordinary term life covers a much broader kind of loss. Accident-only coverage is aimed at a much narrower kind of event.

