In C#, not everything derives from object

When someone points out in a comment that this could be seen as verbal nitpicking, he responds well:

  ...the issue arises because there are the people who 
  understand and use the terms interchangeably, relying on 
  other readers to be like themselves and understand in 
  context of the communication.

  However it's the people who don't understand the 
  differences that the clarification is needed, and they 
  run into trouble, or start making 1/2 correct inferences 
  and mis-communicating to others.

  It pays to be precise, and when in the habit of using the 
  correct terminology, comprehension becomes easier for all 
  parties.

This is very, very true. Particularly when dealing with artifacts as subtle as programming languages, where, e.g., 'type' and 'class' shouldn't be used interchangeably. The problem is bad enough when dealing with core calculi---as this post demonstrates, being precise is doubly important when dealing with feature-rich languages, like C#.