Here are some examples:
* Acoust - relating to sound or hearing (acoustics)
* Aud - to hear (audible, auditorium)
* Otic - relating to the ear (otitis)
* Otoplasty - surgical repair of the ear
* Paracusis - a distortion of hearing
* Phone - sound (phonetic, telephone)
While the root "ous" often refers to hearing, it can also appear in words with other meanings related to the ear, like "Oust," which originally meant "to put out of an ear," and later evolved to mean "to force out or remove."