proconsul vs governor

proconsul and governor both are nouns.

Word	Noun	Adjective	Verb	Adverb
proconsul	Yes	No	No	No
governor	Yes	No	No	No

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

proconsul: a provincial governor of consular rank in the Roman Republic and Roman Empire
governor: the head of a state government

proconsul (noun)	governor (noun)
an anthropoid ape of the genus Proconsul	a control that maintains a steady speed in a machine (as by controlling the supply of fuel)
a provincial governor of consular rank in the Roman Republic and Roman Empire	the head of a state government
an official in a modern colony who has considerable administrative power