king vs female aristocrat

king and female aristocrat both are nouns.

Word	Noun	Adjective	Verb	Adverb
king	Yes	No	No	No
female aristocrat	Yes	No	No	No

As nouns, female aristocrat is a hypernym of king; that is, female aristocrat is a word with a broader meaning than king:

king (noun)	female aristocrat (noun)
(chess) the weakest but the most important piece	a woman who is an aristocrat
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