General Opposites:
* Cooperation: This emphasizes working together instead of competing.
* Harmony: This implies a peaceful and balanced state, the absence of conflict.
* Friendship: This emphasizes a positive and supportive relationship.
* Unity: This focuses on coming together as one.
Specific Opposites, depending on the type of rivalry:
* Alliance: If the rivalry is between groups, an alliance suggests they are working together.
* Mutual respect: If the rivalry is based on animosity, mutual respect would be the opposite.
* Collaboration: If the rivalry is in the context of work or business, collaboration means working together.
* Agreement: If the rivalry involves disagreement, agreement suggests a shared understanding.
The best opposite word will depend on the specific situation and the nuance you want to convey.