spoken vs oral

spoken is not a noun while oral is a noun.

Word	Noun	Adjective	Verb	Adverb
spoken	No	Yes	No	No
oral	Yes	Yes	No	No

spoken (noun)	oral (noun)
	an examination conducted by spoken communication

spoken (adjective)	oral (adjective)
uttered through the medium of speech or characterized by speech; sometimes used in combination	of or involving the mouth or mouth region or the surface on which the mouth is located
	a stage in psychosexual development when the child's interest is concentrated in the mouth; fixation at this stage is said to result in dependence, selfishness, and aggression
	of or relating to or affecting or for use in the mouth
	using speech rather than writing