We distinguish tremors based on their characteristics. A resting tremor occurs when there is NO activation of agonist or antagonist muscles. For example, you are sitting with your arms in your lap or in the arm chair armrests, watching TV, not paying any attention to the arms, and the tremor comes. A postural tremor occurs when one is maintaining a posture such as outstretched arms, and there is an overlap with kinetic or action tremor, in which the tremor increases with use of the arm. For example, people with postural tremors often notice difficulty bringing a cup of water to their mouth.
Intention tremor is less helpful as a term.
None of these tremor types is itself a diagnosis. However, there are some clues to help your neurologist provide a diagnosis. A neurologist experienced in the diagnosis and treatment of movement disorders will be able to comment whether your cerebellum appears to be working OK, and should be able to suspect and systematically evaluate the possibility of dystonia, which can produce a tremor such as you describe. Dystonia is itself not a disease, though many people have it an nothing else and we often don't find a specific cause. It is, of course, impossible to diagnose tremor in this forum.