self-serving vs egoistic

self-serving and egoistic both are adjectives.

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

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

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

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

self-serving (adjective)	egoistic (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