* A person who does something:
* Actor: A person who acts in plays or movies.
* Editor: A person who edits text or images.
* Instructor: A person who teaches.
* Something that does something:
* Generator: A machine that produces electricity.
* Motor: A machine that provides motion.
* Compressor: A machine that compresses air or gas.
* A state or condition:
* Terror: A state of intense fear.
* Humor: A state of amusement.
* Color: A state of being colored.
However, "-or" can also form other words depending on the context:
* Adjectives: Superior (better), inferior (worse)
* Prepositions: Before, after
So, it's important to look at the specific word and the context to understand what it becomes when "-or" is added.