Similar word to pain:

ache, affliction, agony, burn, catch, convulsion, cramp, crick, discomfort, distress, fever, gripe, hurt, illness, injury, irritation, laceration, malady, misery, pang, paroxysm, prick, sickness, smarting, soreness, spasm, sting, stitch, strain, tenderness, throb, throe, tingle, torment, torture, trouble, twinge, wound