General:
* Arrangement
* Collection
* Grouping
* Series
* Assortment
* Set
* Lineup
Formal:
* Configuration
* Disposition
* Formation
Figurative:
* Spread
* Display
* Panorama
Specific:
* Matrix (when referring to a mathematical or computational array)
* List (when referring to a simple ordered array)
Example:
* "The soldiers stood in a perfect array." (arrangement)
* "The store had a wide array of colorful scarves." (assortment)
* "The data is stored in a multidimensional array." (matrix)
The best synonym will depend on the specific context and the desired nuance.