I've been collecting Feedburner stats for several years and am now on my second version of the podcast. I routinely download the Excel data to report to my group on podcast uses.
I've learned that "enclosure download" means somebody actually downloaded a file.
I've learned that a "hit" is when my podcast is loaded in a browser.
I believe that "subscribers" are people who follow my podcast in a feed reader.
But I also get regular stats on "item views" and "item clickthroughs" and I can't find ANY explanation of how these differ from "hits."
Since other people have asked similar questions here and been ignored, I don't have much hope of answers, but if you don't ask the question, the answer is always no.