I'm a usability expert because I can say discoverability

I'm convinced that 75% of being an expert is the field's vocabulary.

I may say "enable paging is broken" but a usability expert would say "paging enablement discoverability is low". The concept is the same, but the exact problem is much more clear using the right vocabulary.

So, I just found a web design glossary which includes all the words that you should know if you are a "web designer". Yeah. I know them. Well, most of them. But it's handy to have the list and they explanations go into decent detail on the subjects.