The Spellchecker is only deployed with a fairly small default dictionary for the English language (english.0). If you think this dictionary is not powerful enough for your purposes you have to get a better dictionary from the Web. Below we have listed some download addresses.
This spellchecker plug-in supports two types of dictionaries. The spellchecker automatically detects the type of dictionary:
The spell checker supports, too, phonetic files. Such files are used to
improve the word matching algorithm. Phonetic files must be installed in the
same directory as the associated dictionary file and must have the same name,
but with the file extension ".phon". The Aspell dictionary packages found at http://www.sf.net/projects/jaxe
are all equipped with phonetic files.