For hearing:
* Eardrum: The membrane in the middle ear that vibrates in response to sound waves.
* Earphone: A device that transmits sound directly into the ear.
* Earwax: A waxy substance produced in the ear canal.
* Earwitness: A person who has heard something.
For shape or appearance:
* Earlobe: The lower, fleshy part of the ear.
* Earring: A piece of jewelry worn on the ear.
* Earmuff: A covering for the ears to protect them from cold or noise.
For other meanings:
* Earmark: To set aside for a specific purpose.
* Earshot: Within hearing distance.
* Earswiggle: A small, harmless insect.
If you can provide more context about what you're looking for, I can help you find a more specific compound word.