Strictly speaking, I think and acronym should be a set of initials that spell a word already in the lexicon, but I am quite prepared to accept the term for pronounceable words

At the risk of picking nits, I'd say there are some pretty well-established acronyms (scuba, radar, laser) that have become words in the lexicon, but that would not have qualified as acronyms under your description. I guess I want to see acronym used properly because I really like the creation of a word in such a way, and its meaning is lessened when it applies to any abbreviation.