Rival (noun)

1. A person or thing competing with another for the same objective or for superiority in the same field of activity.
2. A person who is the equal of another in status, ability, or qualifications.

Origin:

Early 17th century (as a verb): from french rivaliser, from italian rivalizzare, from rivale "a rival", from latin rivalis "using the same stream as another", from rivus "stream".

Examples:

1. He has no rivals in his field.
2. She has a rival for the position.
3. Their companies are rivals in the market.
4. They were rivals for her affections.
5. He sees his brother as his rival in their father's eyes.