expedient vs opportunist

expedient and opportunist both are nouns.

Word	Noun	Adjective	Verb	Adverb
expedient	Yes	Yes	No	No
opportunist	Yes	Yes	No	No

expedient (noun)	opportunist (noun)
a means to an end; not necessarily a principled or ethical one	a person who places expediency above principle

expedient (adjective)	opportunist (adjective)
serving to promote your interest	taking immediate advantage, often unethically, of any circumstance of possible benefit
appropriate to a purpose; practical