When I check spelling, is there a way to get Yahoo mail to accept words,nicknames, etc into the "dictionary"

When I check spelling, is there a way to get Yahoo mail to accept words,nicknames, etc into the "dictionary"

I have lots words- names, places, medicines, etc, etc., that aren't in the Yahoo dictionary when I e-mail. Is there a way to add these words to whatever yahoo uses as a dictionary so that every time I spell check, they don't show up highlighted?When I check spelling, is there a way to get Yahoo mail to accept words,nicknames, etc into the "dictionary"
As far as I know, there isn't an 'add to dictionary' option in yahoo mail as there is in Microsoft applications. yeah, it sucks