hegemon vs major power

hegemon and major power both are nouns.

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

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

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

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

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