Is it possible to for Yahoo Mail Beta, to keep a dictionary of words that are commonly shown as misspelled?

For example, let's say you use Anti-Virus, or anti-virus alot. Is there a place to store these words in the Spell Checker? I know you can save your contact information. I wonder if it's possible to do the same with a dictionary.Is it possible to for Yahoo Mail Beta, to keep a dictionary of words that are commonly shown as misspelled?
An alternative would be to use Mozilla Firefox as your web browser. It has built in spell checking, so when you are composing an e-mail or typing any text, it underlines words it does not recognize. You then have the option of adding your spelling to the dictionary. In fact it helped me to write this response ;-)