Here's what rhymes with superluminal.
luminal Words that almost rhyme with superluminal
usual juvenile usable delusional beautiful mutual suitable movable crucible cuticle moveable fusible mutable provable reusable dutiable doable assumable unusual immovable immutable renewable attitudinal reducible removable deducible unusable presumable commutable unsuitable irreducible inducible consumable disputable latitudinal irremovable producible improvable refutable unmovable unmoveable disprovable institutional longitudinal inscrutable excusable irrefutable manoeuvrable constitutional indisputable distributional executable reproducible nonrenewable construable inexcusable unconstitutional