Prickers are sharp, pointed objects that can cause discomfort or injury. Some synonyms for prickers include thorns, spines, spikes, barbs, needles, prickles, and quills. Thorns are hard, pointed protuberances on plants and trees. Spines are sharp structures found on animals, such as porcupines. Barbs are sharp projections that can cling to clothing or skin. Needles are thin, pointed objects used for sewing or medical purposes. Prickles are short, sharp protrusions on the surface of plants. Quills are the sharp, protective structures found on the backs of porcupines and other animals. All of these words express the concept of something sharp and pointed that can cause pain or injury.