Right, I'll try to put down my understanding of this, which is imperfect and possibly complete rubbish but it spurred thought so tough.
Language defines reality. Language is used to define reality and as it has been carefully attributed it is safe to say that the words used define the thing they are attributed to.
Language describes reality. Language, although used to define things, is unrelated to reality and exists apart.
There's probably a thousand better ways to put it and hopefully someone here is more of an expert than I. The thought spurred was, do certain types show a preference to one or the other? I certainly tend to find I will question say a person who says they are an INTP or an ENTJ if they are of the belief that language and reality are linked directly.
Which side do you hold to most?