margrave vs military governor

margrave and military governor both are nouns.

Word	Noun	Adjective	Verb	Adverb
margrave	Yes	No	No	No
military governor	Yes	No	No	No

As nouns, military governor is a hypernym of margrave; that is, military governor is a word with a broader meaning than margrave:

margrave: the military governor of a frontier province in medieval Germany
military governor: the head of a government established by the military (as in a defeated country)

margrave (noun)	military governor (noun)
a German nobleman ranking above a count (corresponding in rank to a British marquess)	the head of a government established by the military (as in a defeated country)
the military governor of a frontier province in medieval Germany