Could a nuclear surface-combatant hull become a carrier?

If the proposed Defiant class were nuclear powered, could its hulls be repurposed as carriers or cruisers after being laid down?

The answer treats them as large surface combatants already comparable to cruisers; conversion into carriers would depend on hull shape.

The question assumes nuclear propulsion for a proposed Defiant-class hull and asks about conversion after construction has begun. The answer treats the proposed vessel as a large surface combatant whose cruiser or battleship label is a political choice. Conversion into an aircraft carrier receives a more qualified response: it would depend on the hull's shape. Nuclear propulsion alone therefore does not settle the conversion question, and the exchange offers no completed conversion design.