Life insurance terminology shouldn't be confusing. Here is the definition of long-term care rider.
A policy add-on that takes money out of your death benefit in order to pay for long term care (LTC) — nursing homes, private nurses, etc. It's not uncommon to have this and the accelerated death benefit (ADB) considered one item on policies, but the qualifications for each are different: ADB requires a terminal illness diagnosis before being triggered; the LTC rider are triggered by chronic illnesses that leave you unable to take care of yourself.
LTC coverage can also be purchased as a standalone product from some companies, but can be more expensive and harder to qualify for.