egoistic vs egocentric

egoistic is not a noun while egocentric is a noun.

Word	Noun	Adjective	Verb	Adverb
egoistic	No	Yes	No	No
egocentric	Yes	Yes	No	No

As adjectives, egoistic and egocentric are synonyms defined as:

egoistic and egocentric: concerned chiefly or only with yourself and your advantage to the exclusion of others

Other synonyms of egoistic include egoistical, self-centered, self-centred, self-seeking, self-serving, selfish.

egoistic (noun)	egocentric (noun)
	a self-centered person with little regard for others

egoistic (adjective)	egocentric (adjective)
concerned chiefly or only with yourself and your advantage to the exclusion of others	concerned chiefly or only with yourself and your advantage to the exclusion of others