self-interest vs self-concern

self-interest and self-concern both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-interest	Yes	No	No	No
self-concern	Yes	No	No	No

As nouns, self-interest and self-concern are synonyms defined as:

self-interest and self-concern: concern for your own interests and welfare

Other synonyms of self-interest include egocentrism, egoism, self-centeredness.

self-interest (noun)	self-concern (noun)
concern for your own interests and welfare	concern for your own interests and welfare
taking advantage of opportunities without regard for the consequences for others