What's the difference between vizier and vizierate?

Vizier

Definition:

(n.) A councilor of state; a high executive officer in Turkey and other Oriental countries.

Example Sentences:

(1) A party spokesman, Alain Vizier, said on Sunday that Mr Le Pen had "dramatised" the incident, adding that the Front National leader "was fine".
(2) So he crafted a vision of him as the grand vizier because that was easier for everyone to appreciate and understand.
(3) Carker, Dombey's "Grand Vizier", has wonderfully white teeth and a smile that never extends beyond his mouth.
(4) In the 2nd half of the 8th century A.D., the Barmakids, descendants of an Iranian princely house of Central Asia, succeeded for 3 generations as viziers and governors of the caliphs to be very popular with the common people and, at the same time, to achieve considerable influence, wealth and power at the court of the reigning Abbasids.

Definition:

Example Sentences:

(1) A party spokesman, Alain Vizier, said on Sunday that Mr Le Pen had "dramatised" the incident, adding that the Front National leader "was fine".
(2) So he crafted a vision of him as the grand vizier because that was easier for everyone to appreciate and understand.
(3) Carker, Dombey's "Grand Vizier", has wonderfully white teeth and a smile that never extends beyond his mouth.
(4) In the 2nd half of the 8th century A.D., the Barmakids, descendants of an Iranian princely house of Central Asia, succeeded for 3 generations as viziers and governors of the caliphs to be very popular with the common people and, at the same time, to achieve considerable influence, wealth and power at the court of the reigning Abbasids.