What is the difference between probate and letters of administration in Prince Edward Island?

This answer covers the law of Prince Edward Island.

In Prince Edward Island, probate is the grant that goes to an executor named in a will, while letters of administration are the grant that issue when no executor takes the job or when there is no will. The grant issued to an executor is Letters Probate (Form 65U). Where there is a will but no executor acts, Letters of Administration with the Will Annexed (Form 65W) issue.

A named executor may decline by filing a renunciation (Form 65K). If named executors fail to take out probate after thirty days' notice from an interested party, letters of administration with the will annexed may be granted instead. With no will, you apply for a grant of administration, and the petition must list the next of kin and heirs at law and state the grounds of your right to administer. Where no letters have issued on an intestacy, you must first cite those with a prior right to accept or refuse administration before applying yourself.

Applications go to the Supreme Court's Estates Section by petition under Rule 65. The forms are 65A for probate, 65B for administration with the will annexed and 65C for administration on an intestacy. A lawyer can confirm which applies.