Can you tell how many letters are in the word? It wouldn't be too difficult to do, but it would come down to statistical probabilities. Basically the computer would have a dictionary for reference the font for comparison and just give you a list of words that match the pattern, it would then need a human element to choose the correct word. A lot like a spell checker actually.
I can't say I know of any software though. Can you give us a print screen, the forums collective minds can work as a computer and get you the right answer?