egoistic vs self-serving

egoistic and self-serving both are adjectives.

Word	Noun	Adjective	Verb	Adverb
egoistic	No	Yes	No	No
self-serving	No	Yes	No	No

As adjectives, egoistic and self-serving are synonyms defined as:

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

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

egoistic (adjective)	self-serving (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