The current dictionary is fine, except sometimes the game will accept acronyms occasionally, which is unexpected. I've found a few by accident. Is it that some acronyms can be acceptable words as well, or is it just happenstance? What's the difference?
If by "acronym" you mean a pronounceable word created from initial letters, like "laser" or "awol", then they are accepted, unless always written with capitals, like "NATO". But an abbeviation that is not normally pronounced as a word, like "rsvp", is not allowable, whether it is written with capitals or lower case letters.
Well, that's the current policy, but the actual list we use was compiled by other people, and may include some "words" that don't meet those conditions. If there are any specific examples that seem to be wrongly accepted (or wrongly rejected for that matter) I'd be happy to review them, B-B-B.