prince vs aristocrat

prince and aristocrat both are nouns.

Word	Noun	Adjective	Verb	Adverb
prince	Yes	No	No	No
aristocrat	Yes	No	No	No

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

prince: a male member of a royal family other than the sovereign (especially the son of a sovereign)
aristocrat: a member of the aristocracy

Other hypernyms of prince include blue blood, patrician, adult male, man.

prince (noun)	aristocrat (noun)
a male member of a royal family other than the sovereign (especially the son of a sovereign)	a member of the aristocracy