Here are some options:
Words:
* Independent: This emphasizes the separate, self-sufficient nature of the entities.
* Autonomous: Similar to independent, but with a focus on self-governing.
* Disjoint: Highlights the distinctness of the elements.
* Parallel: Implies moving in the same direction but not connected.
* Coexistent: Suggests being in the same place or time but not interacting.
Phrases:
* Separate but equal: Used to describe something that is divided but with the intention of fairness.
* Side by side: Emphasizes physical proximity without merging.
* United yet diverse: Used to describe a group that is unified in some way but also maintains its unique characteristics.
* Individually distinct: Focuses on the unique qualities of each part.
The best word or phrase will depend on the specific context of your usage.