egoist vs disagreeable person

egoist and disagreeable person both are nouns.

Word	Noun	Adjective	Verb	Adverb
egoist	Yes	No	No	No
disagreeable person	Yes	No	No	No

As nouns, disagreeable person is a hypernym of egoist; that is, disagreeable person is a word with a broader meaning than egoist:

Other hypernyms of egoist include unpleasant person.

egoist (noun)	disagreeable person (noun)
a self-centered person with little regard for others	a person who is not pleasant or agreeable
a conceited and self-centered person