superpower vs hegemon

superpower and hegemon both are nouns.

Word	Noun	Adjective	Verb	Adverb
superpower	Yes	No	No	No
hegemon	Yes	No	No	No

As nouns, hegemon is a hyponym of superpower; that is, hegemon is a word with a more specific, narrower meaning than superpower:

superpower: a state powerful enough to influence events throughout the world
hegemon: a leading or paramount power

superpower (noun)	hegemon (noun)
a state powerful enough to influence events throughout the world	a leading or paramount power