They're All the Same
Sorry about the confusion.
All these terms are descriptive only (not a diagnosis) and refer to a group of disorders which cause pain & dyfunction within or around the jaw joints. The most modern term is tmjd, but tmd is also acceptable. Tmj itself should not be used to describe any disorder, as it is simply the name of the joint itself, like knee or elbow. Your dentist can give a dignosis & help.