Mathias Verraes has an interesting post to his site suggesting that using verbs in class names can make for easier to understand and easier to read code - more "natural language."

When you first learned Object Oriented Programming, somebody probably told you that objects map to things. And that still holds true most of the time. And maybe somebody explained it using the simple heuristic to “look for the nouns”, which can indeed be a great discovery technique. But then somebody probably phrased that as “class names should not have verbs in them”. To me, that rule is severely limiting the possibilities for your models. So here are some cases where I prefer to use verbs.

He suggests that class names, in some cases, could be used as "messages" to the developers using them in the OOP. He includes some suggestions (based on the suggestion of nouns from another post) that use verb-names to convey what they're doing. He also talks about three specific cases - specifications, exceptions and interfaces - and includes samples of each using this idea of verb-based class names.