self-centeredness vs egoism

self-centeredness and egoism both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-centeredness	Yes	No	No	No
egoism	Yes	No	No	No

As nouns, self-centeredness and egoism are synonyms defined as:

self-centeredness and egoism: concern for your own interests and welfare

Other synonyms of self-centeredness include egocentrism, self-concern, self-interest.

self-centeredness (noun)	egoism (noun)
concern for your own interests and welfare	concern for your own interests and welfare
	(ethics) the theory that the pursuit of your own welfare is the basis of morality