1. Agent or doer of an action: This is the most common meaning of "-or." It indicates the person or thing that performs the action described by the root word.
* Actor: someone who acts
* Teacher: someone who teaches
* Inventor: someone who invents
* Operator: someone who operates something
* Editor: someone who edits
2. State or condition: "-or" can also indicate a state or condition, often associated with a particular feeling or experience.
* Terror: a state of extreme fear
* Favor: a feeling of affection or goodwill
* Horror: a feeling of extreme fear or disgust
3. Instrument or tool: Sometimes, "-or" refers to an instrument or tool used for a specific purpose.
* Calculator: a device used for calculating
* Elevator: a device used for lifting people or things vertically
* Generator: a device that generates electricity
4. Place or location: In some words, "-or" can indicate a place or location.
* Auditorium: a large hall for public gatherings
* Dormitory: a building or part of a building where students sleep
* Observatory: a place for observing celestial bodies
5. Other: There are some words ending in "-or" that don't neatly fit into the categories above. These often have specific meanings that are best learned individually.
* Mayor: the chief elected official of a city or town
* Governor: the chief executive of a state
* Senator: a member of a senate
It's important to note that the suffix "-or" can have slightly different meanings depending on the context. To understand the specific meaning of a word ending in "-or," you should look at the whole word and consider how it is being used in the sentence.