If I were to describe the words left, right, front and back, I could say, those are positions.
But what if I need to divide those into smaller groups: left and right, front and back?
How could I describe those smaller groups?
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It depends in part what you're describing and if there is already a pattern established for such positions, for example, in anatomy, anteromedial combines front and center.
But assuming there is no pattern, I would use the usual adjective suggestions: use the main adjective and modify it with the other.
On a written page, we usually describe something's placement as in the "upper left corner" rather than "left upper corner". For a crowded room, I would use front left, rear left, front right, rear right.
On the other hand, describing pockets, the side usually comes first: left front pocket, right front pocket, etc.
So, the context of what position you're trying to refer to matters.