The disintegrate spell states:
This spell automatically disintegrates a Large or smaller nonmagical object or a creation of magical force.
You create a Large hand of shimmering, translucent force in an unoccupied space that you can see within range.
You create a sword-shaped plane of force that hovers within range.
This wording suggests that disintegrate can instantly destroy either of these spells, since they are explicitly creations of magical force. But spiritual weapon states:
You create a floating, spectral weapon within range...
The weapon deals force damage, and is almost identical to Mordenkainen's sword, but is it a creation of magical force that disintegrate can instantly destroy?