not bad
Overall good. Some suggestions though:
1. Since it looks rather lame to have a word
cut off or to have the period of a sentence
way out like this comma , you
might suggest minimum/maximum number of letters
for the words the user types in. Either that or
format the text in such a way as to make the
spacing automatically correct.
2. If you want a challenge, set up a script that
determines whether to use "a" or "an" in front
of the inputted word.