king vs Mithridates the Great

king and Mithridates the Great both are nouns.

Word	Noun	Adjective	Verb	Adverb
king	Yes	No	No	No
Mithridates the Great	Yes	No	No	No

king (noun)	Mithridates the Great (noun)
(chess) the weakest but the most important piece	ancient king of Pontus who expanded his kingdom by defeating the Romans but was later driven out by Pompey (132-63 BC)
one of the four playing cards in a deck bearing the picture of a king
a checker that has been moved to the opponent's first row where it is promoted to a piece that is free to move either forward or backward
a male sovereign; ruler of a kingdom
a very wealthy or powerful businessman
a male competitor who holds a preeminent position
the husband or widower of a queen
preeminence in a particular category or group or field