self-centeredness vs egocentrism

self-centeredness and egocentrism both are nouns.

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

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

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

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

self-centeredness (noun)	egocentrism (noun)
concern for your own interests and welfare	concern for your own interests and welfare