Difference between Postmaster General and Viceroy

POSTMASTER GENERAL vs VICEROY: NOUN

One who governs a country, province, or colony as the representative of a monarch.
A large and handsome American butterfly (Basilarchia archippus syn. Limenitis archippus). Its wings are orange-red, with black lines along the nervures and a row of white spots along the outer margins. The larvæ feed on willow, poplar, and apple trees.
The governor of a country or province who rules in the name of the sovereign with regal authority, as the king's substitute.
The archippus, a handsomely colored American butterfly, Basilarchia archippus, formerly known as Limenitis disippus.
A vice-king; the governor of a kingdom or colony, who rules in the name of the king (or queen), as the deputy of the sovereign: as, the viceroy of India or of Ireland.
An orange and black North American butterfly (Limenitis archippus), resembling but somewhat smaller than the monarch.
A man who is the governor of a country, province, or colony, ruling as the representative of a sovereign.
Governor of a country or province who rules as the representative of his or her king or sovereign
Showy American butterfly resembling the monarch but smaller

Airmail, Stamps, Air marshal, Equerry, Postie, Demitting, Postman, Philatelist, Postmistress, Adjutant general, Adjutant, Viceroy, Consul general, Postal, Postmaster

Courtier, Imperial, Nawab, Ruler, Protectorate, Vassal, Grand vizier, Emperor, Maharaja, Viceregal, Satrap, Alty, Lord, Vicereine, Limenitis archippus

Telegrams, Governor general, Airmail, Stamps, Air marshal, Postie, Postman, Philatelist, Postmistress, Adjutant general, Adjutant, Viceroy, Consul general, Postal, Postmaster

Potentate, Khedive, Courtier, Imperial, Nawab, Ruler, Protectorate, Vassal, Grand vizier, Emperor, Maharaja, Viceregal, Satrap, Lord, Vicereine

Lead fundraiser for Charlotte RNC named postmaster general.
Postmaster General Smith Speaks of the Keystone State.
Letter to Hubert Works, Postmaster General from Chas.
Deputy Postmaster General, usually relating to personnel matters.
The Chief Postal Inspector shall report to, and be under the general supervision of, the Postmaster General.
Offices of First, Second, Third, and Fourth Assistant Postmasters General abolished and Deputy Postmaster General and four Assistant Postmasters General established by Reorg.
Jefferson consulted Postmaster General Gideon Granger of Connecticut and Attorney General Levi Lincoln of Massachusetts while drafting the letter.
Postal Service: The General Accounting Office and the Postmaster General.
Smith, Secretary of State William Seward, Postmaster General Montgomery Blair, and Attorney General Edward Bates.
The postmaster general and the deputy postmaster general are also voting members of the Board of Governors.