opportunist vs expedient

opportunist and expedient both are nouns.

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

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

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