Difference between Heir Presumptive and Prince Regent

HEIR PRESUMPTIVE vs PRINCE REGENT: NOUN

Someone who will inherit only if no better choice for an heir is born.
See heir apparent.
An heir who stands to inherit the estate, title, or office of an intestate ancestor, but whose claim can be defeated if a relative who is closer to the ancestor is born prior to the ancestor's death.
A person who expects to inherit but whose right can be defeated by the birth of a nearer relative

A prince who rules a monarchy in the capacity of a regent who is unfit to rule for whatever reason
A prince who rules during the minority, absence, or incapacity of a sovereign.

Succession, Peacock throne, Kingship, Dynastic, King, Prince consort, Princeling, Monarch, Figurehead, Prince regent, Coronation, Heir, Successor, Throne, Heir apparent

Zedekiah, Hagiographer, Alfonso xiii, Dauphin, Henry bolingbroke, Consort, Emperor, King, Nobleman, Heir apparent, Aristocrat, Queen consort, Monarch, Holy roman emperor, Heir

Succession, Peacock throne, Kingship, Dynastic, King, Prince consort, Princeling, Monarch, Figurehead, Prince regent, Coronation, Heir, Successor, Throne, Heir apparent

Cesare borgia, Seleucus, Herod antipas, Hagiographer, Dauphin, Henry bolingbroke, Emperor, King, Nobleman, Heir apparent, Aristocrat, Queen consort, Monarch, Holy roman emperor, Heir

He is the son of Eliwood, the main character of Fire Emblem: The Blazing Blade, and heir presumptive of Pherae.
Frenchman, that he is not heir presumptive to another crown, and that he has previously taken the civic oath.
Prince Albert became King George VI and the young Princess Elizabeth became heir presumptive to the throne.
Known as "The Brat" in the Heraldic Circle, the Heir-presumptive lives up to her nickname.
Roger was made lieutenant of Ireland and was declared heir presumptive to the Crown.

The prince regent must be a partner in a consummated marriage.
Prince Regent reprimanded the court for mistaken leniency, and Proctor, like Hull, was retired in disgrace.
Some cruise ships navigate up the river to this spot in Prince Regent National Park.
Prince Regent in place of his Brother the King who has left for lands afar.
There was a redback spider nest when I arrived, Prince Regent of Khryseis!
After they leave, the Prince Regent enters, dressed as a "tattered vagabond.".
Which will leave me and His Highness, the Prince Regent.
The Prince Regent Hotel has 22 rooms on 4 floors.
Mr and Mrs Leach meet the Prince Regent of Malaysia.
Prince of Wales, to rule as Prince Regent, saw the dawning of an era of significantly more flexible government.