Doris

Example:In a legal battle, the opposing parties often see each other as adversaries, making the case highly competitive.

Definition:A person who opposes or competes with another, often in a contest, argument, or in court proceedings.

Example:As a project manager, she became the opposer of the outdated policies, advocating for new and improved methods.

Definition:A person or thing that opposes, resists, or contradicts what is proposed or done.