hegemon vs great power

hegemon and great power both are nouns.

Word	Noun	Adjective	Verb	Adverb
hegemon	Yes	No	No	No
great power	Yes	No	No	No

As nouns, great power is a hypernym of hegemon; that is, great power is a word with a broader meaning than hegemon:

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

Other hypernyms of hegemon include major power, power, superpower, world power.

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