expedient vs favourable

expedient is a noun but favourable is not a noun.

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

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

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