Difference between Heir Presumptive and Archduke

HEIR PRESUMPTIVE vs ARCHDUKE: 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

The son or male-line grandson of an emperor of the Austro-Hungarian Empire.
A prince of the imperial family of Austria.
A title formerly borne by some of the sovereign princes of Austrasia, Lorraine, and Brabant, but for several centuries held exclusively by the ruler of the archduchy of Austria (afterward emperor of Austria, and now of Austria-Hungary); now only a titular dignity of the princes of the house of Austria, as archduchess is of the princesses.
Used as a title for such a nobleman.
In certain royal families, especially that of imperial Austria, a nobleman having a rank equivalent to that of a sovereign prince.
A sovereign prince of the former ruling house of Austria

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

Viscount, Viceroy, Prince regent, Monarch, Nobleman, Prince consort, Ducal, Kaiser, Grand vizier, Holy roman emperor, Hohenzollern, Archduchess, Charles, Ferdinand, Maximilian

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

Il duce, Viscount, Viceroy, Prince regent, Monarch, Nobleman, Prince consort, Ducal, Kaiser, Grand vizier, Holy roman emperor, Hohenzollern, Archduchess, Charles, Ferdinand

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.

World War I essentially began when Archduke Ferdinand was assassinated.
Schaffhausen with Frederick, Archduke of Austria and foe to Sigismund.
Archduke Ferdinand, who was in command of the advanced army.
Archduke Ferdinand waving his hand in the distance.
This report Conrad sent on to the Archduke.
Princip shot the Archduke and his wife Sophie.
Archduke of Dunk, Human Highlight Film John Wooden.
Archduke Franz Ferdinand and his wife were murdered.
Because the capable Archduke Charles, Duke of Teschen refused the command, the emperor appointed his 18 year old brother, Archduke John.
In the Tyrol and neighboring territories, not so touched by Evangelicalism, Archduke Ferdinand and his successor, Archduke Maximilian, enacted comprehensive policies of reform.