Each Tiki feature may have its own spellchecking option.

To enable spellechecking with creating or editing articles, select the Spellchecking option in the CMS Features section of the Articles Config page.

CMS Features section of the Articles: Config page.

To enable spellechecking with creating or editing a wiki page, select the Spellchecking option in the Wiki Features section of the Wiki Config page:

Wiki Features section fo the Wiki: Config page.

Spellcheck is not bundled. You must get the language file from Sourceforge and import the data with phpMyAdmin or similar.