The Collaborative International Dictionary of English v.0.48:
Shogunate \Sho*gun"ate\ (sh[=o]*g[=oo]n"[asl]t), n. The office or dignity of a Shogun. [Written also Siogoonate.] [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Siogoonate \Sio*goon"ate\, n. See Shogunate. [1913 Webster]