duke vs grand dukedom

duke

• A grand duke. 

• The male ruler of a duchy (female equivalent: duchess). 

• A fist. 

• The sovereign of a small state. 

• A high title of nobility; the male holder of a dukedom. 

• Any of various nymphalid butterflies of the Asian genera Bassarona and Dophla. 

• To hit or beat with the fists. 

• To give cash to; to give a tip to. 

grand dukedom

• The title of grand duke or grand duchess, with its pertaining privileges and obligations; contrast grand duchy.