Wraithe

A wraith is like a Wight, a half spirit or someone who has been killed yet lives on by some dark sorcery (necromancy or a Morgul-blade). However, a Ringwraith is a human who has fallen completely under the spell of one of the nine Rings of Power, and faded away to a wraith. When Frodo is stabbed by the Witch-King of Angmar in the first book he is infected by the evil magic from a Morgul blade; if Glorfindel had not saved him he would have become a wraith.