Why many carrier hulls resemble battlecruisers

Are carrier hulls essentially enlarged cruiser hulls?

They often resemble battlecruiser forms because carriers need stable, fast hulls with good cruising performance.

Hull form and operating requirements matter more than a strict lineage for every carrier. Flight operations require speed, stability, and useful cruising performance, all qualities that make battlecruiser-like forms attractive. Those priorities appear in Ark Royal and the Illustrious class, even though neither example requires every carrier to be a literal battlecruiser conversion. The modern Queen Elizabeth-class carrier hull shows the same family resemblance when considered as an evolved battlecruiser form. HMS Eagle's battleship origins and Unicorn's blend of County-class cruiser and battlecruiser influences show that carrier development drew on more than one capital-ship tradition.