You can take a look at source-code-wordle.de, I have analyzed there the most frequently used suffixes of class names of the .NET framework and some other libraries.
The top 20 are:
- attribute
- type
- helper
- collection
- converter
- handler
- info
- provider
- exception
- service
- element
- manager
- node
- option
- factory
- context
- item
- designer
- base
- editor
