favorable vs expedient

favorable is not a noun while expedient is a noun.

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

favorable (noun)	expedient (noun)
	a means to an end; not necessarily a principled or ethical one

favorable (adjective)	expedient (adjective)
(of winds or weather) tending to promote or facilitate	serving to promote your interest
encouraging or approving or pleasing	appropriate to a purpose; practical
giving an advantage
presaging or likely to bring good luck or a good outcome