Using the JSpell Console tool, which is available to registered owners of JSpell, you may add words to dictionaries or even create your own dictionaries.
The standard English dictionary supplied with JSpell is designed to accommodate professional settings. The dictionary purposefully excludes archaic and obsolete variations of words (this is the same policy as Microsoft Word). The dictionary also excludes racial, religious and ethnic slang which may be considered offensive or illegal in some environments. We keep our dictionaries up to date with words concerning emerging trends, current events, political figures, technology, etc.
Your users will always receive relevant, appropriate and professional suggestions. The standard US English dictionary supplied with JSpell contains approximately 110,000 words. Other dictionaries are available with up to 600,000 words. And don't forget, you can create your own using open-source word lists!