Aural and Oral are unrelated even though they both concern sound. They come from different roots.
Aural means “related to ears or hearing” and oral means “related to mouths or speaking”. Let's take a look at the usage of aural and oral in a sentence:
I hope you don’t get an aural (ear) infection from swimming.
Living in the city provides too much aural stimulation. (it is too noisy)
Oral hygiene is important for health and social relations!
Will you be giving an oral presentation or only written?
Be careful not to confuse aural or oral with audio (related to sound):
Incorrect: The aural level on the stereo is too high. (correct: audio level)
Aural also has another less common meaning, which is “like an aura” or “related to auras.” An aura is a glow, radiation, feeling, or atmosphere surrounding something:
The moon’s aural rings look especially nice tonight!
This usage of aural is quite rare.