oral vs exam

oral and exam both are nouns.

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

As nouns, exam is a hypernym of oral; that is, exam is a word with a broader meaning than oral:

Other hypernyms of oral include examination, test.

oral (noun)	exam (noun)
an examination conducted by spoken communication	a set of questions or exercises evaluating skill or knowledge

oral (adjective)	exam (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