concussion

noun 0.623

contusion

noun 0.592

counterblow

noun 0.572

head crash

noun 0.531

whiplash

noun 0.525

occiput

noun 0.519

contrapositive

noun 0.517

neurotrauma

noun 0.513

head-on collision

noun 0.507

counter-attack

noun 0.505

counterpunch

noun 0.500