Shogunate-country ruled by a shogun. The shogunate was the hereditary military dictatorship of Japan (1192–1867). Legally, the shogun answered to the emperor, but, as Japan evolved into a feudal society, control of the military became tantamount to control of the country.
Shogun-military leader. Shogun was the title of the military dictators of Japan during most of the period spanning from 1185 to 1868. Nominally appointed by the Emperor, shoguns were usually the de facto rulers of the country, though during part of the Kamakura period shoguns were themselves figureheads.
"Isn't" is the best option from the list in terms of completing these sentence. This is primarily because "isn't" is a contraction of the two words "is" and "not.
