1) (a kind of) drug used to calm a person's nerves and to cause sleep (barbiturate)

2) of, concerning, the nerves (neural)

3) the branch of medical science that is concerned with nerves (neurology)

4) (a medicine, drug) used to calm the nerves and reduce stress (sedative)

5) (an experience causing) an excited feeling passing like a wave along the nerves (thrill)

6) to excite the nerves of the skin by touching (a person) lightly, often to cause laughter; to have, feel, cause, an itching or tingling sensation (tickle)