A person who keeps away from or shuns something. As an avoider of conflict, she often stayed silent during arguments.
A person who evades or escapes from something, especially a responsibility or duty. He was known as an avoider of chores, always finding excuses to leave the house.
An object, device, or software feature that prevents or mitigates the occurrence of something undesirable. The drone's collision avoider kept it from crashing into trees.