oral exam vs oral

oral exam and oral both are nouns.

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

As nouns, oral exam and oral are synonyms defined as:

Other synonyms of oral exam include oral examination, viva, viva voce.

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

oral exam (adjective)	oral (adjective)
	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