expedience vs opportunism

expedience and opportunism both are nouns.

Word	Noun	Adjective	Verb	Adverb
expedience	Yes	No	No	No
opportunism	Yes	No	No	No

As nouns, expedience and opportunism are synonyms defined as:

expedience and opportunism: taking advantage of opportunities without regard for the consequences for others

Other synonyms of expedience include self-interest, self-seeking.

expedience (noun)	opportunism (noun)
the quality of being suited to the end in view	taking advantage of opportunities without regard for the consequences for others
taking advantage of opportunities without regard for the consequences for others