Apparitional adjective – Resembling or characteristic of a phantom. Otherworldly and apparitional are semantically related. In some cases you can use "Otherworldly" instead an adjective "Apparitional".
Otherworldly adjective – Of, relating to, or being part of a reality beyond the observable physical universe. Apparitional and otherworldly are semantically related. Sometimes you can use "Apparitional" instead an adjective "Otherworldly".