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Don't end your class names with -er.

Naming is a superficial issue that is subjective as opposed to a structural problem that is pervasive.

The point of the example wasn't to talk about naming. It was to talk about a fundamental structural problem with OOP.

Clearly you are not familiar with the classic aphorism:

"There are 2 hard problems in computer science: cache invalidation, and naming things"

or its cousin:

"There are 2 hard problems in computer science: cache invalidation, naming things and off-by-one errors".