* Noun: A person or thing competing with another for the same object or position.
* Verb: To compete with another for the same object or position.
* Adjective: Competing with another for the same object or position.
Here are some examples:
* Noun: "He's a fierce rival in the race for the championship."
* Verb: "The two companies rival each other for market share."
* Adjective: "The rival teams fought hard for the victory."