A name doesn't communicate its intent well enough.
When you first implement something, you have to name things somehow. You give the best name you can think of at the time and move on. Later, you may have an insight that lets you pick a better name.
What to Do
Some teams use i/j/k for loop indexes or c for characters ; these aren't too confusing if the scope is reasonably short. Similarly, you may occasionally find that numbered variables communicate better.
Different people may create the classes at different times. (People may forget to explore the existing classes before adding more.) Occasionally, you'll find people doing this intentionally (but misguidedly) so they can distinguish the names.
What to Do
Pick the best name, and use Rename Method (or field, constant, etc.) to give the same name to the same things. Once you've done this, you may find that some classes appear to be more similar than they did before. Look for a duplication smell and eliminate it.
Improve communication. May expose duplication.
The Eiffel language uses a common pool of words for the names of its library features. You can use this technique as inspiration: Look to existing library names for the vocabulary you use.
Chapter 5. Unnecessary Complexity
"You aren't gonna need it." “Ron Jeffries
Code is sometimes more complicated than it has to be to solve the problem at hand. There are two causes for this problem:
Remove these problems when you run into them. You'll often find that this can lead to further insight and simplification.