king vs Frederick William I of Prussia

king and Frederick William I of Prussia both are nouns.

Word	Noun	Adjective	Verb	Adverb
king	Yes	No	No	No
Frederick William I of Prussia	Yes	No	No	No

king (noun)	Frederick William I of Prussia (noun)
(chess) the weakest but the most important piece	son of Frederick I who became king of Prussia in 1713; reformed and strengthened the Prussian army (1688-1740)
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