aural - oral
Aural means ‘relating to your ears and your sense of hearing’. Aural is pronounced /^ɔːrəl/ or /^aʊrəl/.
I have used written and aural material.
Oral means ‘relating to your mouth’. It also describes things that involve speaking rather than writing. Oral is pronounced /^ɔːrəl/.
...an oral test in German.
Both aural and oral are fairly formal words. They are used mainly to talk about teaching methods and examinations.