On spell checking, can I saved special words into a dictionary, is there such a thing in Yahoo?

Other spell checkers like Google, AOL etc one has the option in saving the words that the spell checker considers misspelled, and maybe valid words just not in the English dictionary, in those spell checkers one of the options is add into dictionary, have not ever seen this in Yahoo mail spell checker???On spell checking, can I saved special words into a dictionary, is there such a thing in Yahoo?
unlike the others, yahoo spellchecker is web-based dictionary and therefore saving special words or characters is not an option. With Gmail you can store this info into your account settings and all you are really doing is writing a simple HTML code to ignore those words when spell checking within your id...(you aren't really writing the code but that's what it does when you select to add it) with AOL Browser its basically the same but it actually stores it within your preferences rather than on-line. The main reason Yahoo doesn't do that is because although you may be logged into yahoo in the US every service and page within Yahoo is worldwide, so it would have to translate every entry from every user in order to store a word in the dictionary.