expedient vs advantageous

expedient is a noun but advantageous is not a noun.

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

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

expedient (adjective)	advantageous (adjective)
serving to promote your interest	giving an advantage
appropriate to a purpose; practical	appropriate for achieving a particular end; implies a lack of concern for fairness