egocentrism vs self-centeredness

egocentrism and self-centeredness both are nouns.

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

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

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

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

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