Is there a term for the Jedi and Sith?
I mean if you don't know if the person is a Jedi or a Sith, but you know the person is using a lightsaber and has a big knowledge about the force, what a term are you using?
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At the broadest definition, you're simply looking for Force Sensitive or Forceful.
A Force-sensitive, also known as a Forceful, was a being who was highly attuned to the flow of the Force. Force-sensitives could, with training, learn to sense and manipulate the Force.
If you want to get more specific, and qualify that they are more than just sensitive to the Force, the person can be defined as a Force User ignoring whether or not they belong to a faction. If you want to assign them a grouping based on their allegiance, you might go with Force Adept or Dark Side Adept for Jedi or Sith respectively.
The terms Force-user and Force-sensitive were distinct in meaning. Force-sensitive denoted anyone with Force power, latent or active, while being called a Force-user implied that the individual had at least some understanding and control of their abilities and was able to use them to accomplish specific tasks. The latter was also used in a more specific sense as a general term for Force-trained individuals who did not belong to either of the two major Force traditions, the Jedi and the Sith. Another term for Force-user was Force Adept, for dark-siders sometimes Dark Side Adept (not to be confused with the Imperial title and organization proper).