The words, painter, teacher, starter and thinker, all, and all the suffix ER. What does the suffix ER mean?

The suffix -ER typically denotes a person who performs a specific action or has a certain quality. It is commonly used to form job titles or to indicate comparative degrees. In this context, -ER indicates someone who does the action or job specified by the root word.

For example:
- Painter: a person who paints.
- Teacher: a person who teaches.
- Starter: a person who starts.
- Thinker: a person who thinks.

Note that the suffix -ER can have other meanings depending on the context, but in this case, it indicates a person who performs the action or possesses the quality associated with the root word.