We don't have synonyms for wilhelm ii yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are wilhelm i and wilhelmi.
(N) :
(Friedrich Wilhelm Viktor Albert; 27 January 18594 June 1941) the last German Emperor and King of Prussia from 1888 until his abdication in 1918, which marked the end of the German Empire as well as the Hohenzollern dynasty's 300-year rule of Prussia.
(N) :
German emperor and King of Prussia from 1888 to 1918.
(N) :
(Friedrich Wilhelm Viktor Albert; 27 January 18594 June 1941) the last German Emperor and King of Prussia from 1888 until his abdication in 1918, which marked the end of the German Empire as well as the Hohenzollern dynasty's 300-year rule of Prussia.
(N) :
German emperor and King of Prussia from 1888 to 1918.