egoistical vs self-centered

egoistical and self-centered both are adjectives.

Word	Noun	Adjective	Verb	Adverb
egoistical	No	Yes	No	No
self-centered	No	Yes	No	No

As adjectives, egoistical and self-centered are synonyms defined as:

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

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

egoistical (adjective)	self-centered (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