archduke vs prince

archduke and prince both are nouns.

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

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

archduke: a sovereign prince of the former ruling house of Austria
prince: a male member of a royal family other than the sovereign (especially the son of a sovereign)

archduke (noun)	prince (noun)
a sovereign prince of the former ruling house of Austria	a male member of a royal family other than the sovereign (especially the son of a sovereign)