egoistical vs egocentric

egoistical is not a noun while egocentric is a noun.

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

As adjectives, egoistical and egocentric are synonyms defined as:

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

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

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

egoistical (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