As I'm sure you already know, we have a lot of "fancy words" in English. That's why there's a ton of long and short words that may have the same, or similar, meaning. There may be a more specific meaning to these longer words, but it's been lost to history as English evolves and expands. I say all of that to say that 'caveat' is just a formal, fancier version of 'warning'. If anything, it may be a little weaker than the actual word 'warning', but more attention-grabbing than a word like 'condition'.