Spellchecker and WYSIWYG are bundled together.  However they can be activated independently.

Spellchecker provides this facility throughout OnTheButton .

The supplied dictionary contains approximately 100,000 words.  However, as with all dictionaries, there will be specialist terms, names, eg of people or places, which are not included. These words can be added to the vocabulary in your OTB system, by any user with appropriate privileges.

For convenience this user(s) can be provided with a regular list of words which users, in your school, have found missing from the dictionary and which should be considered for inclusion in the dictionary.

Words, once submitted, for inclusion in the dictionary, are added overnight and are included in all future spellcheck operations.