The Abbasid Caliphate differed from others in that it did not have the same borders and extent as Islam. Particularly, in the west of the Caliphate, there were multiple smaller caliphates that existed in relative peace with them.
The major difference between the protist and the animal kingdom is protists are unicellular protozoans and unicellular & multicellular, but animals are multicellular animals.
As nouns the difference between lord and king is that lord is (label) the master of the servants of a household; (label) the master of a feudal manor while king is a male monarch; a man who heads a monarchy if it's an absolute monarchy, then he is the supreme ruler of his nation or king can be (chinese musical instrument).