expedience vs self-interest

expedience and self-interest both are nouns.

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

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

expedience and self-interest: taking advantage of opportunities without regard for the consequences for others

Other synonyms of expedience include opportunism, self-seeking.

expedience (noun)	self-interest (noun)
the quality of being suited to the end in view	concern for your own interests and welfare
taking advantage of opportunities without regard for the consequences for others	taking advantage of opportunities without regard for the consequences for others