expedient vs means

expedient and means both are nouns.

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

As nouns, means is a hypernym of expedient; that is, means is a word with a broader meaning than expedient:

Other hypernyms of expedient include agency, way.

expedient (noun)	means (noun)
a means to an end; not necessarily a principled or ethical one	to have the ability to produce a particular effect or achieve an end
	an artifact (that is instrumental in accomplishing some end) for accomplishing some end
	considerable capital (wealth or income)

expedient (adjective)	means (adjective)
serving to promote your interest
appropriate to a purpose; practical